The UK Consumer Price Index (CPI) for August rose by 3.8% year-on-year, aligning with expectations. Core CPI also matched forecasts, increasing by 3.6%.
Airfare prices were a major factor in the reduction of core annual inflation, climbing 2.1% from July to August 2025, compared to a 22.2% rise in the previous year over the same period. This shift is attributed to the holiday season occurring earlier in July this year, impacting the index’s timing.
Inflation Trends
Services inflation experienced a minor decrease from 5.0% to 4.7% in August. In contrast, goods inflation increased slightly from 2.7% to 2.8%. Despite these shifts, headline inflation remains elevated.
Overall, these developments are unlikely to affect the Bank of England’s current outlook. Core prices remain high, with services inflation showing only a gradual moderation. Goods inflation also contributes to the continued high headline figure.
The inflation data for August came in exactly as expected, which suggests little immediate market shock. We should therefore see implied volatility on instruments like short-term interest rate options and gilt futures decrease in the coming days. This presents an opportunity for traders to sell options, betting that prices will remain relatively stable now that this key data point has passed without a surprise.
With the Bank of England’s key interest rate holding at 4.00%, this data does nothing to encourage a rate cut. Sticky services inflation, even at a slightly lower 4.7%, remains the main reason we believe the BOE will stay on hold through the winter. As a result, traders will likely continue to push back expectations for the first rate cut from late 2025 into the first quarter of 2026.
Market Implications
The market was pricing a small chance of a cut by December, but we now expect that pricing to be removed. This means there is value in positioning for short-term interest rates to remain firm by selling SONIA futures contracts expiring in early 2026. Looking back at how slow the BOE was to react to the inflation surge of 2022, we see them being extra cautious about cutting rates too soon this time around.
This concern over sticky prices is supported by recent labour market data, which showed UK wage growth still running at a firm 5.5% in July. This persistent wage pressure directly feeds into the high services inflation that the BOE is trying to control. Until we see a significant cooling in the jobs market, it is difficult to build a strong case for lower interest rates.
For the pound, this steady interest rate outlook should provide a solid floor of support against other currencies. We don’t see a major rally on this news alone, but sterling is likely to remain firm, particularly against currencies where central banks are closer to cutting rates. Traders could consider buying GBP/USD call options with a three-month expiry to position for this relative strength.
