2.4 Lender of Last Resort

Who would act as the lender of last resort in a crisis?

The core question is structural and unavoidable under the chosen currency regime: who would act as the lender of last resort in a crisis? The short answer is constrained and explicit. Under pure sterlingisation, banks would have no automatic access to the Bank of England as lender of last resort. The Scottish Central Bank would provide liquidity support to solvent banks against good collateral, backed by the Scottish Government’s fiscal resources and pre-built reserves. Where possible, the Scottish Government would negotiate additional commercial or bilateral liquidity facilities in advance. This is a real constraint of sterlingisation, which is why strong bank capital requirements, high reserves, and strict fiscal rules are essential.

A full lender of last resort can create its own currency in unlimited amounts to provide emergency liquidity. The Bank of England can do that for sterling. A Scottish Central Bank that does not issue sterling cannot. Any liquidity it provides must come from resources it actually holds or can raise—reserves, fiscal capacity or pre-arranged facilities. That limitation is structural, not temporary. A credible monetary framework states it plainly and designs the rest of the system around it: prevention through capital and supervision, buffers through reserves, and a fiscal backstop that is real rather than rhetorical. This section sets out what the Scottish Central Bank can still do, what it cannot do, and why the accompanying policies are non-negotiable rather than optional.

The currency choice of sterlingisation, the legal basis for unilateral use without formal union, the mandate of the Scottish Central Bank, and the supporting arrangements of fiscal rules, deposit protection and reserves all converge on this constraint. Precision about the finite nature of liquidity capacity, the boundary between liquidity support to solvent institutions and fiscal resolution of insolvency, and the primacy of prevention is essential to credibility with the banking system, markets and the public. The 18–24 month working timeline provides the window in which reserves accumulation, legal powers, and supervisory intensity must advance sufficiently to make the limited toolkit credible from Independence Day.

Current Position and Legal/Institutional Baseline

Under the present constitutional arrangements, the Bank of England acts as lender of last resort for the sterling banking system. It can create sterling liquidity in the quantities required to support solvent institutions against collateral in a systemic stress event. Prudential regulation and resolution sit within the same institutional complex. Scotland has no separate capacity to create sterling or to act as a full issuer-central-bank lender of last resort.

Independence under the sterlingisation model ends any automatic claim on Bank of England last-resort facilities. Successive UK governments have ruled out a formal currency union, which might have included shared or delegated arrangements, and do not seek it. The baseline after a lawful Yes vote is therefore a financial system whose banks operate in sterling, whose payment systems clear in sterling, and whose domestic central bank cannot manufacture that currency. International experience of economies that use another state’s currency without formal union confirms the same structural limitation: emergency liquidity is finite and must be pre-positioned or fiscally backed. The regime's quality depends on how seriously it takes that limitation in designing capital standards, supervision, reserves, and fiscal rules. Ignoring it is an unrealistic path.

Mechanism and Delivery

The mechanism is a limited liquidity-assistance framework operated by the Scottish Central Bank, backed by reserves and fiscal capacity, and supplemented where possible by pre-arranged, non-guaranteed facilities. Even without the ability to create sterling, the Scottish Central Bank would not be powerless. It would be able to provide liquidity support to solvent banks against high-quality collateral, using its own reserves and resources; operate a framework for emergency liquidity assistance within the limits of available assets; coordinate information and, where possible, technical cooperation with the Bank of England and other central banks; and act as the focal point for crisis management and communication.

These tools are real but finite. They depend on the prior accumulation of reserves and on the government’s ability to support the Bank fiscally if required. Lending to insolvent institutions against weak collateral would convert a liquidity tool into a hidden fiscal bail-out. The framework therefore emphasises solvent banks and good collateral as the boundary of central-bank liquidity support, with resolution and fiscal tools handling insolvency. The legal powers to lend against collateral, the valuation and eligibility criteria for that collateral, and the coordination protocols with the resolution authority would be established in the Bank’s statute and related legislation before or on Independence Day.

Because the central bank’s resources are limited, the ultimate backstop in a systemic crisis is fiscal. The Scottish Government would need the capacity and the legal framework to support the financial system if the Bank’s own resources proved insufficient. That is one reason strict fiscal rules, a credible medium-term fiscal plan, and early reserve-building are non-negotiable elements of the wider framework. Substantial sterling and foreign-exchange reserves held by the Scottish Central Bank improve the capacity to provide liquidity without immediate recourse to the government. Building those reserves is therefore a strategic priority from the outset. A dedicated later section addresses the reserves strategy; the link to lender-of-last-resort capacity is direct: under sterlingisation, reserves are part of the crisis toolkit, not only a balance-of-payments buffer.

In addition to domestic resources, efforts would be made in advance to negotiate bilateral swap or liquidity lines with other central banks where mutual interest exists; commercial contingent liquidity facilities; and clear technical cooperation arrangements with the Bank of England on payment systems and information-sharing—distinct from any lender-of-last-resort commitment. Such facilities are not guaranteed and would depend on negotiation. They cannot be assumed in the base case. Their existence would improve resilience; their absence would reinforce the need for strong domestic buffers. Dependence on UK goodwill for automatic last-resort lending is not part of this design; dependence on possible negotiated cooperation for technical and bilateral facilities is acknowledged as a residual, non-guaranteed layer.

The most effective approach is to reduce the probability that emergency liquidity will be required at scale. This is achieved through high minimum capital and liquidity requirements for banks operating in Scotland; robust supervisory standards and early intervention powers; a credible deposit protection scheme that maintains depositor confidence; conservative risk-management expectations, particularly in the early years of independence; and transparent, disciplined fiscal policy that supports overall macroeconomic stability. Prevention is more reliable than cure when the cure is constrained. The Scottish Central Bank’s prudential and resolution functions are therefore not separate from the lender-of-last-resort problem; they are the first line of defence against needing a large last-resort operation at all.

Continuity Design

Continuity of deposit safety, payment systems and the capacity to manage liquidity stress without disorderly failure is a design requirement. The limited lender-of-last-resort toolkit exists to protect that continuity within the structural constraint of sterlingisation. Solvent banks can access liquidity against good collateral. Deposit protection maintains depositor confidence and reduces the likelihood of rapid outflows that turn a liquidity pressure into a solvency event. High opening prudential standards reduce the probability that institutions enter stress under-capitalised or under-liquid. Fiscal rules and reserves accumulation ensure that the finite backstop is real rather than rhetorical.

The boundary between liquidity support and fiscal resolution is kept sharp. Central-bank lending is for solvent institutions against eligible collateral. Insolvency is handled through resolution powers and, where necessary, fiscal tools under the rules. Continuity of contracts, mortgages, savings and pensions depends on the financial system remaining orderly. The lender-of-last-resort design, constrained as it is, is part of the machinery that protects that orderliness. Gaps in legal powers, reserves, or supervisory intensity at the moment of independence would increase transition risk; early legislation, prioritisation of reserve building, and high opening standards are mitigations.

Constraints and Trade-offs

Legal constraints

The Scottish Central Bank’s power to provide liquidity against collateral is a matter of domestic legislation and does not require UK agreement. Automatic access to Bank of England last-resort facilities is unavailable and not claimed. Pre-arranged bilateral or commercial facilities depend on negotiation and cannot be guaranteed by Scottish law. The legal constraint is therefore the need for clear domestic powers, collateral frameworks and resolution coordination on the Scottish side, while accepting that external last-resort capacity is neither automatic nor a legal entitlement. Constitutional continuity supplies the platform for the Bank’s statute; the monetary constraint is independent of that platform.

Fiscal constraints

The fiscal burden appears as the cost of capital and liquidity regulation (borne largely by banks), the opportunity cost and funding of reserves, and the contingent fiscal backstop. Fiscal planning must recognise contingent liabilities. They sit inside the fiscal rules and the medium-term plan; they are not off-book wishes. Under sterlingisation, the ultimate backstop in a systemic crisis is fiscal because the central bank cannot create the currency. Strict fiscal rules and a credible medium-term plan are therefore not optional companions to the currency choice; they are part of the crisis toolkit. The fiscal constraint is treating contingent financial-stability support as a real planning factor rather than an afterthought.

Operational constraints

Operational delivery requires that the Bank exist, that legal powers to lend against collateral are in place, that reserves are being accumulated, that supervisory intensity is sufficient to identify solvent institutions and eligible collateral, and that coordination with the resolution authority is clear. Full-scale reserves take time to build. The operational constraint is most acute in the early period of independence, when reserves are still accumulating, and confidence is still forming. Mitigation is early clarity on sterling continuity, strong deposit protection from day one or without a gap via transitional arrangements, high opening prudential standards and visible fiscal rules. Crisis contingency planning is developed further in a later section of this part.

Political constraints

Political pressure may arise to deny the constraint, to assume Bank of England support without a formal union, or to treat fiscal backstops as costless. The political constraint is the need to remain honest about finite liquidity capacity, against both denial and fatalism. The response is that safety under sterlingisation depends on buffers and prevention, not automatic external last-resort lending; that the constraint is genuine and treated as such; and that the framework’s response is higher ex-ante standards and fiscal-reserve capacity, not denial. Credibility depends on stating the limitation without softening and on designing the rest of the system around it.

Time constraints

Reserves accumulation, legal powers, supervisory readiness and any negotiation of bilateral facilities sit inside the 18–24 month working timeline and continue thereafter. The dangerous window is early independence. The time constraint is therefore the need to advance prevention standards and initial reserves sufficiently by Independence Day while accepting that full-scale buffers build over subsequent years. Competence in the preventive architecture and the legal framework for limited liquidity support takes priority over claims of unlimited capacity that the currency regime cannot deliver.

Consistency with the Wider Framework

Lender-of-last-resort limits are the direct consequence of the sterling choice and of the legal basis for unilateral use without formal union. They shape the Scottish Central Bank’s mandate, the urgency of reserves, the design of deposit protection, the strictness of fiscal rules and the crisis contingency framework. They align with continuity of deposits and payments as a political and economic priority: the less credible the backstop story, the more important prevention and deposit insurance become. There is no tension with constitutional continuity; the constraint is monetary, not legal.

The Bank’s prudential and resolution functions are the first line of defence. Deposit protection maintains confidence. Reserves provide the finite liquidity pool. Fiscal rules and the medium-term plan make the ultimate backstop credible. The conditional path to a future Scottish currency, if tests are met, would restore the theoretical ability to create the domestic unit; launching that currency in a crisis would be the worst moment, which is one reason the path is subject to strict pre-published conditions rather than available as an emergency escape. The framework treats the last-resort constraint as structural under sterlingisation and designs the surrounding institutions and rules to live with it rather than to wish it away.

Hardest Critiques and Direct Responses

Feasibility

The hardest practical critique is that Scotland cannot be financially safe without Bank of England backing, or conversely that the constraint is so severe that sterlingisation is impossible. The response is direct. Safety under sterlingisation depends on buffers and prevention, not automatic external last-resort lending. The constraint is genuine and is treated as such. The framework responds with higher ex-ante standards—capital, liquidity, supervision—and fiscal-reserve capacity, not denial. A limited liquidity-assistance framework is feasible if the Bank exists, reserves are being built, and the legal powers to lend against collateral are in place. A full issuer-style lender of last resort is not feasible under sterlingisation and is not claimed. Critics who treat any finite liquidity capacity as fatal must explain why other non-issuing currency regimes exist; critics who wave the constraint away must explain where unlimited sterling liquidity would come from.

Cost and fiscal burden

Critics will argue that the contingent fiscal backstop, the funding of reserves and the cost of higher capital standards impose an unsustainable burden. The response is that these costs and contingent liabilities are the price of operating a sterlingised regime honestly. They sit inside the fiscal rules and the medium-term plan. Contingent liabilities are recognised rather than hidden. The cost of capital and liquidity regulation; the opportunity cost of reserves and the design of the fiscal backstop are public responsibilities. Under-funding prevention or reserves would increase the probability that the finite backstop is tested. The framework treats the costs as real and necessary rather than as optional extras.

Dependence on agreement

Automatic Bank of England last-resort support is unavailable and not assumed. Pre-arranged bilateral or commercial facilities depend on negotiation and cannot be guaranteed. Technical cooperation on payments and information-sharing is desirable and distinct from last-resort lending. The response is that dependence on UK goodwill for automatic last-resort capacity is not part of the design. Dependence on possible negotiated facilities is acknowledged as a residual, non-guaranteed layer. The core toolkit—prevention, reserves, limited central-bank liquidity against collateral, and fiscal backstop—is domestic. Adversarial negotiation on other files does not remove the structural constraint; it reinforces the need for domestic buffers.

Transition risk

The dangerous window is early independence, when reserves are still being accumulated, and confidence is still forming. Mitigation is early clarity on sterling continuity, strong deposit protection from day one or without a gap, high opening prudential standards and visible fiscal rules. Gaps in legal powers or supervisory intensity would increase risk; early legislation and prioritisation address them. The framework does not claim that transition risk is zero. It claims that prevention-first design and refusing to assume unavailable external last-resort capacity minimise the risk.

Alternatives (status quo and previous proposals)

Assuming Bank of England last-resort support without a formal union is unavailable and is not a basis for policy; that alternative is rejected. Immediately introducing a Scottish currency partly to regain last-resort capacity would restore the theoretical ability to create the domestic unit, but only if the new currency has credibility; launching it in a crisis would be the worst moment, so the option is deferred until tests are met. Sterlingisation without high capital, reserves or fiscal rules would maximise vulnerability under the constraint and is rejected. The status quo of Bank of England last-resort capacity ends with independence under the chosen currency model; the framework replaces it with a finite, prevention-weighted domestic toolkit rather than with denial or with an unprepared new currency.

Political and public credibility

The claim most likely to be called unrealistic is that Scotland can be financially safe without Bank of England backing, or that the constraint can be ignored because other policies will somehow compensate. The precise answer is that safety is conditional on the buffers and prevention this framework treats as mandatory, that the constraint is stated without softening, and that the design lives with finite liquidity capacity rather than pretending otherwise. Credibility with markets and the banking system depends on that honesty and on the visible build of capital standards, reserves, deposit protection and fiscal rules. A strategy that assumed external last-resort support that has been refused, or that under-resourced the domestic alternatives, would forfeit that credibility. The framework states the limitation and the response with equal clarity.

Position Summarised

Under sterlingisation, the Bank of England is no longer the automatic lender of last resort. The Scottish Central Bank can provide liquidity support within the limits of its reserves and the government’s fiscal capacity. Additional facilities would be sought but cannot be counted upon. This is a genuine constraint of the currency choice. It is managed by building strong bank capital and liquidity standards, accumulating substantial reserves, maintaining strict fiscal rules, and treating financial-stability preparedness as a core priority from day one. The framework does not pretend the limitation away; it designs around it. Prevention first; finite liquidity tools second; fiscal backstop as last resort within the rules. Solvent institutions against good collateral define the boundary of central-bank support; insolvency is handled through resolution and fiscal tools. The early period of independence is the highest-risk window; early clarity, high opening standards and visible buffers are the mitigations.

Conclusion

Who acts as lender of last resort under sterlingisation? The Scottish Central Bank, within finite resources, backed by reserves and fiscal capacity, supplemented where possible by pre-arranged facilities that are not guaranteed. The Bank of England does not automatically fill that role. That is the monetary reality of unilateral sterling use. The response is not to abandon sterlingisation in the transition period; it is to build a regime that needs emergency liquidity less often, and that can deploy limited liquidity more effectively when required. High prudential standards, deposit protection, reserves and fiscal discipline are therefore not separate ornaments—they are the practical answer to the last-resort constraint. This section states the constraint without softening; the surrounding sections supply the design that lives with it. Every subsequent arrangement in this part—deposit protection, reserves strategy, crisis contingency and the conditional path to a future currency—presupposes an honest account of finite liquidity capacity under sterlingisation. This section provides that account and the prevention-weighted response it requires.

Series Footer

This analysis forms part of People’s Future Scotland: The Independence Debate, a series examining the practical, legal and institutional questions that would arise in any move to independence. Each section is designed to withstand scrutiny by setting out mechanisms, constraints and continuity requirements with equal clarity. The series proceeds from the premise that a decision of this magnitude requires a process and a prospectus that both supporters and opponents can recognise as serious.