London Is Becoming a “Dip-In, Dip-Out” City. How Should an International Buyer Finance a £5m UK Bolthole?

Knight Frank’s latest analysis describes a new form of global mobility in which ultra-wealthy families maintain several well-managed homes, spend less time in any one place and favour flexibility over a single trophy residence. London remains commercially and socially important—but for some buyers it has become a base rather than a principal home. The finance should reflect that distinction.

The Knight Frank article published on 18 September 2026 says some globally mobile clients spend fewer than 90 days in any one location. It links the change to tax pressure, easier technology and changing lifestyles, with demand shifting towards smaller, turnkey homes offering management, security and services.

For London, Knight Frank’s Rupert des Forges uses the phrase “presence over residence”. He describes the capital as a “dip-in, dip-out city” for clients who remain deeply connected to it without choosing to live here full-time. He also gives a striking illustration: a buyer who might once have allocated US$30m to a primary trophy home may now spend around US$15m on a more practical bolthole. This is an example of changing client behaviour, not a market-wide rule or evidence that every buyer has halved their budget.

This develops Willow’s earlier analysis of finance-ready buyers gaining leverage as prime London prices softened. That article examined price, negotiation and execution. The new Knight Frank evidence addresses a different decision: how a globally mobile family should fund a London property when the property remains important but is no longer the centre of the family’s life.

The Mortgage Question Is No Longer Simply “Can They Borrow?”

A foreign national or British expatriate can sometimes obtain a UK mortgage, but the word “international” covers radically different cases. A British executive paid in US dollars while based in Dubai is not the same as a Saudi entrepreneur drawing income from several private companies. An American family using London during the school year is not the same as a European principal seeking a serviced apartment for business visits.

The lender may need to consider nationality, current and future residence, tax residence, visa position, income source, income currency, overseas liabilities, credit history and the country in which assets are held. Intended property use also matters: a second home, a home for family, a future principal residence and an investment property can sit in different lending and regulatory categories.

This is why the first question should be what the London property is meant to achieve. Once the purpose, usage pattern and desired liquidity are clear, the funding routes can be compared. Starting with a product label—“expat mortgage”, “private bank” or “Lombard loan”—risks forcing a complex client into the wrong framework.

A £5m Bolthole Creates a Capital-Allocation Decision

Consider a client who lives principally in the Gulf and wants a £5m London apartment for approximately 60 days a year. Paying £5m cash may deliver simplicity and remove mortgage interest. It also places £5m, plus transaction costs, into one illiquid asset that is used intermittently. A £2m cash contribution with £3m of borrowing retains £3m of gross liquidity, but introduces interest cost, underwriting, valuation and refinancing risk.

That is not an argument for maximum leverage. It is an argument for comparing the outcomes. If retained capital remains invested, its future return is uncertain; the cost of borrowing may be variable; and selling investments can have tax and portfolio consequences. The correct comparison belongs with the client’s tax, legal and investment advisers—not in a simple claim that debt is “cheaper” than cash.

Transaction taxes also remain material. HMRC’s rules can apply a surcharge where a buyer is non-resident for the relevant Stamp Duty Land Tax test, and additional-property or corporate rules may also affect the position. Mortgage debt does not normally reduce the property price on which SDLT is calculated. The ownership and tax analysis should therefore be completed by qualified advisers before exchange, not inferred from the lending structure.

Five Routes an International Buyer May Need to Compare

When a Conventional International Mortgage May Be the Cleanest Route

A mortgage secured only against the London property can create useful separation between the property and the client’s investment portfolio. It may suit a client with stable, documentable foreign income who wants to preserve investments without pledging them to the lender. The loan can also be easier to understand than a wider private-bank relationship when the objective is simply to finance the property.

However, “conventional” does not mean uniform. Lenders differ on acceptable countries, currencies, employment types, business income, bonuses, age, interest-only repayment strategies and maximum loan size. They may convert foreign income using their own exchange rate, apply a haircut or stress the currency exposure. The FCA’s mortgage rules also contain specific provisions for foreign-currency loans, reflecting the risk that exchange-rate movements can change the burden of repayments.

For clients with no active UK credit footprint, evidence from overseas banking and credit systems may be needed. Documents may require certification or translation. These are manageable issues when identified early, but they can undermine a purchase timetable if discovered after the offer is agreed.

When a Private Bank May Add Value

A private bank can sometimes assess the balance sheet more holistically than a lender focused mainly on earned income. That can be useful where wealth is substantial but annual income is variable, distributed across jurisdictions or linked to a privately owned business. The bank may combine a property loan with custody, investment management or other credit facilities.

That flexibility has a price and often a relationship requirement. The client may need to transfer assets under management, maintain minimum liquidity or accept variable rather than fixed pricing. A private bank will still require full source-of-wealth, source-of-funds, tax-residence and ownership information. It is not a way around due diligence, nor is it automatically faster or cheaper.

The decision should compare the complete relationship economics. A lower mortgage margin can be outweighed by investment-management fees, transfer costs or restrictions on the assets the client wants to retain elsewhere. Equally, a strong existing banking relationship can produce a more coherent result than arranging the property loan in isolation.

Lombard Lending Can Preserve Liquidity—but Transfers Risk

Lombard lending raises cash against an investment portfolio. For an international buyer, it can avoid an immediate sale of eligible securities and may help fund a deposit or part of the purchase. It can be particularly relevant when the portfolio already sits with a bank able to lend against it.

The facility is not equivalent to a risk-free cash substitute. The bank applies different lending values to different assets; concentrated, volatile or illiquid holdings may receive limited value or no value at all. If markets fall, currencies move or the bank changes its lending value, the borrower may need to provide more collateral, repay part of the facility or accept asset sales. Interest rates are commonly variable.

A client using securities to support property finance therefore needs sufficient headroom and a clear response to a margin call. The investment adviser must consider the effect of pledging the portfolio, while tax and legal advisers address ownership, disposals and cross-border consequences. Willow’s role is to coordinate and compare the borrowing routes, not to recommend investment strategy.

The Tax Framework Has Changed, but Finance Is Not Tax Advice

The mobility described by Knight Frank sits against a changed UK tax background. HMRC confirms that from 6 April 2025 the remittance basis was abolished and replaced by a residence-based foreign income and gains regime. Qualifying new residents can claim relief on eligible foreign income and gains during their first four years of UK residence, subject to detailed conditions and consequences.

Those rules help explain why residence planning is central to internationally mobile families, but they do not determine a mortgage recommendation. Days spent in the UK, historic residence, family connections, property availability and other factors may matter to the statutory residence test. The lender’s definition of residence can also differ from the tax analysis. Clients should obtain specialist advice and ensure the mortgage application accurately reflects their circumstances.

An International London Property Funding Review

Before approaching lenders, the review should map the client’s principal residence, citizenship, expected UK usage, tax residence, income jurisdictions, income currencies, available cash, investment assets, overseas property, liabilities and existing bank relationships. It should also record who will occupy the London property, how it will be owned and whether any future move to the UK is contemplated.

The output should compare credible routes rather than produce a single headline rate. For each route, the client needs to understand the likely leverage, evidence, pricing basis, fees, asset requirements, currency exposure, repayment plan and execution timetable. There should also be a fallback if a lender changes policy, values the property below the purchase price or cannot complete in time.

How Willow Private Finance Can Help

Willow can assess an international London purchase as a cross-border funding decision rather than a generic mortgage application. We establish the property’s purpose, the client’s residence and income position, the assets available, the target leverage and the liquidity that should remain after completion. We can then compare relevant specialist mortgage lenders, private banks and portfolio-backed routes.

We also work alongside wealth managers, international tax advisers, private-client lawyers, accountants and buying agents. Each professional remains responsible for their regulated or specialist advice; our role is to ensure that the borrowing structure, evidence and transaction timetable are aligned with the decisions they are making.

This is especially valuable before the property negotiation begins. A buyer who understands the credible funding range, conditions and timetable can decide how much cash to commit and avoid presenting a £5m offer that depends on an untested £4m facility.