The U.K.’s annual inflation rate hit a hotter-than-expected 3.8%in July, according to data released by the Office for National Statistics (ONS) on Wednesday.

Economists polled by Reuters had anticipated inflation would reach 3.7% in the twelve months to July, after it picked up to 3.6% in June, exceeding forecasts.

July core inflation, which excludes more volatile energy, food, alcohol and tobacco prices, rose by an annual 3.8%, up from 3.7% in the twelve months to June.

The rise in inflation pushed the consumer price index to its highest annual rate since the beginning of last year, Grant Fitzner, chief economist at the ONS, commented Wednesday.

“The main driver was a hefty increase in air fares, the largest July rise since collection of air fares changed from quarterly to monthly in 2001. This increase was likely due to the timing of this year’s school holidays,” he noted in a post on the X social media platform.