The Office for National Statistics (ONS) said consumer price inflation accelerated to 3.5% in the year to September, up from 3.1% in the year to August. The increase marks a reversal of the recent easing in headline inflation and comes ahead of the government's forthcoming Budget.
According to the ONS, much of the upward pressure in the September reading was linked to surging fuel prices. Higher pump prices for petrol and diesel made a notable contribution to the headline rate, offsetting some of the downward momentum seen in other areas of the consumer price index earlier in the year.
The timing of the inflation uptick is significant for fiscal policymakers preparing the Budget, as a higher headline rate can affect public expectations about living costs, tax receipts and the scope for spending commitments. Government departments and parliamentary watchers will be closely monitoring whether the trend in energy and fuel costs continues when setting economic assumptions.
For households, the renewed rise in inflation highlights persistent cost pressures after a period of gradual easing. While the ONS figures do not prescribe policy, they are likely to be scrutinised by markets, analysts and policymakers assessing the balance between supporting growth and containing price pressures going forward.
Further detail on the components of the rise and how they feed through to different sectors of the economy will be published in the ONS's full release and subsequent monthly updates, which market participants will use to gauge whether the September increase signals a durable shift or a shorter-term blip.