UK inflation climbed to a five-month peak of 3.1% in August, though underlying measures that strip out rising energy costs remained unchanged, according to official data released Wednesday, a day ahead of an anticipated Bank of England decision to hold borrowing costs steady.

The rise in the annual headline rate aligned with projections from economists surveyed by a news outlet, who had anticipated an effect from the renewed hostilities in the Gulf region. Additional increases are anticipated over the coming months as household energy bills — which follow global market prices with a delay — are set to rise, while fuel costs for petrol and diesel were cited as a key driver of the uptick in inflation recorded in August.

Grant Fitzner, chief economist at the Office for National Statistics, noted that elevated airfares — particularly on long-distance routes — had contributed to the uptick in prices, while rising crude oil and petrol costs had pushed up both raw material expenses and factory gate prices.

The inflation figures present a policy challenge for Prime Minister Andy Burnham and finance minister John Healey, who have taken steps to ease cost-of-living pressures on households but face constrained room for manoeuvre in the budget scheduled for 28 October, given the current state of the public finances. Burnham added that conflict in the Middle East was exerting upward pressure on inflation across multiple countries, not only domestically.

Healey remarked, following the publication of the latest inflation data, that the effects were being felt across household utility payments, grocery spending, and fuel costs.

Even though the headline inflation figure came in above the central bank's July projections, monetary policymakers are broadly expected to place greater weight on core measures of price growth when assessing their next steps. According to ONS data, the core inflation rate — stripping out volatile categories like food and fuel — remained unchanged at 2.6% for the fourth consecutive month in August.

Services-sector inflation in the UK — a metric the Bank of England monitors closely given its connection to wage growth and sustained price pressures — held steady at 3.4%. Charlotte O'Leary, associate economist at the National Institute of Economic and Social Research, noted that the absence of substantial second-round effects led her institution to anticipate the MPC would keep rates on hold at its forthcoming meeting.

ONS figures released on Tuesday indicated that wage growth held near its lowest point since 2020, while O'Leary noted that building price pressures, combined with steady expansion data, could ultimately provide room to lift interest rates without substantially harming the broader economy.

The pound dipped modestly following the release of the latest inflation data. Market pricing puts the probability of the Bank of England raising its benchmark rate by 25 basis points on Thursday at around one in five. Markets are pricing in a 75% probability of two interest rate increases before the close of 2026, driven by apprehension that rising energy costs could feed through into wider inflationary pressure.

The bank forecast earlier this week that UK headline inflation would reach a peak of 3.9% in early 2027. The United Kingdom recorded the fastest economic expansion among G7 nations during the opening two quarters of 2026, a performance that analysts say could place upward pressure on prices.

Data on producer prices — which track input costs and output prices across the manufacturing sector — pointed to elevated risks for the Bank of England regarding sustained inflationary pressures over the medium term. According to the ONS, producer prices climbed 3.7% year-on-year in August, exceeding all analyst projections and building on an upwardly revised 3.3% recorded the previous month. Producer prices climbed 6.1%, while the figure for July was adjusted upward to 5.8% from an earlier estimate of 4.9%.