Five Sterling Scenarios, One Earnings Bridge: A Currency Stress Test for UK Equity Analysts

Sterling has rarely been a background variable for UK equity analysts, and 2026 is no exception. Rate differentials, gilt supply and shifting expectations for the Bank of England have kept the trade-weighted index moving within a range wide enough to matter for earnings. Yet most research files still carry a single line lifted from the annual report: a ten per cent move in sterling equates to roughly X million pounds of operating profit. That line is a starting point, not an answer. Used carelessly, it flatters companies whose hedging is opaque and penalises those whose disclosure is simply more honest.

The approach set out here is deliberately unglamorous. It is not a forecast for sterling. It is a method for converting what companies already disclose into a defensible range of outcomes, and for grading the quality of that disclosure along the way.

Why the headline sensitivity number misleads

Most FX sensitivities published in UK annual reports share three weaknesses. First, they apply a uniform shift to a basket, which hides the fact that many FTSE 100 companies are far more exposed to the dollar than to the euro, and a domestic mid-cap may be exposed to neither at the revenue line but heavily at the cost line. Second, they usually blend translation and transaction effects without saying so. Third, they rarely state the hedging assumption behind the number, which means the sensitivity may describe an unhedged position that the company does not actually run.

An analyst who takes the number at face value is effectively outsourcing part of the earnings model to the reporting entity, on terms the entity chose.

Step one: rebuild the revenue map from the segment note

Begin with the IFRS 8 segment disclosure and the revenue disaggregation note. Three geographies matter and they are not the same thing: where the customer is located, where the contract is denominated, and where the cash is ultimately received. A UK-listed engineer may sell into North America, invoice in dollars, and manufacture in the Midlands. Another may sell into Germany, invoice in euros, and source components from Asia in dollars.

Build a simple three-column table for each reporting segment: billing currency, cost currency, and funding currency. Where the notes do not permit this, that absence is itself information. Record it.

Step two: separate translation from transaction from competition

Translation affects the restatement of overseas profits into sterling and moves earnings without touching cash generation in the local market. Transaction exposure arises where receipts and payments are mismatched, and it hits gross margin directly. Competitive exposure is the slowest and most dangerous: a weaker pound may allow a domestic manufacturer to hold price against imported rivals, or it may simply erode the margin it needs to survive.

Analysts should map each of the three separately, because they respond to different scenarios. A dollar-only move and a broad trade-weighted move produce materially different answers for a company with euro-denominated costs.

Step three: read the hedging note as a disclosure test

The hedging note is where the quality of a currency disclosure is usually decided. Look for notional amounts, the tenor of the hedge book, the average rates contracted, and the proportion of forecast exposure covered. A rolling twelve-month programme tells you the near term is protected and the following year is wide open; a five-year programme tells you the reverse. Net investment hedges on foreign subsidiaries behave differently again and should be traced to the reserves movement rather than to the income statement.

Score each company on how much of this is disclosed in usable form. A group that provides notionals, rates and maturities has given the analyst the raw material for a scenario map. A group that offers only a qualitative statement has not, and the correct response is a wider valuation range, not a narrower one.

Step four: treat the financing and distribution decisions as currency signals

Debt currency mix belongs in the same exercise. A dollar bond issue, a cross-currency swap or a multicurrency revolver all change how a sterling move flows through interest costs and, eventually, through distributable reserves. Dividends declared in dollars and share buybacks executed against a translational earnings benefit can flatter per-share metrics while quietly raising balance-sheet risk. Where a buyback is funded from overseas cash, the currency question becomes a capital allocation question.

Step five: run five scenarios, not one

A workable set for a 2026 research file:

• Flat: trade-weighted sterling unchanged, as the base case.
• Broad weakness: sterling down ten per cent across the basket.
• Broad strength: sterling up ten per cent across the basket.
• Dollar divergence: dollar down eight per cent against sterling while the euro is unchanged.
• Cross divergence: dollar up six per cent against sterling while the euro is down four per cent.

For each, produce an earnings bridge in pence per share across three lines: translation of overseas profit, transaction impact on gross margin, and financing and derivative effects. The output is not a point estimate. It is a dispersion range, and the width of that range is the analyst's honest measure of uncertainty.

A FTSE 100 exporter and a domestic mid-cap, contrasted

Take a hypothetical large-cap with seventy per cent of revenue billed in dollars, a predominantly sterling cost base, and dollar-denominated debt. Under broad sterling weakness, translation and transaction both help, while interest costs rise modestly. The headline sensitivity suggests an immediate earnings uplift. But if the hedge book covers most of the next twelve months at rates struck when sterling was stronger, the reported benefit arrives a year late and arrives smaller. An analyst relying on the headline number will overstate near-term earnings and understate the following year's.

Now take a domestic-facing mid-cap with all revenue in sterling, a third of cost of goods sourced from Asia in dollars, and a dollar revolver. Weakness in sterling delivers no translation benefit at all, compresses margin, and raises interest charges. A disclosure stating that the group has minimal foreign currency exposure is technically true at the revenue line and materially misleading overall. That gap between the statement and the substance is the diagnostic signal.

A short scorecard for the research file

Five questions, scored zero to two: is revenue disclosed by billing currency; are translation and transaction effects distinguished; are hedge notionals, tenors and rates given; is the debt currency mix visible; and is prior constant-currency commentary reconciled to reported figures. A total below five means the currency sensitivity should be treated as unknown, and the valuation range widened accordingly.

None of this requires a view on where sterling trades next year. It requires only that the analyst reads the notes in a fixed order, records what is missing, and refuses to let a company-supplied sensitivity stand in for an earnings model. In an environment where currency is again a live variable for UK equities, that discipline is the difference between a defensible estimate and a borrowed one.