British house prices fell last month in annual terms at the fastest rate in 12 years and soaring interest rates are likely to herald more weakness in the housing market, mortgage lender Halifax said on Friday.

House prices dropped 2.6 per cent year-on-year in June, after a 1.1 per cent fall in May, Halifax said. It was the largest such fall since June 2011.

On the month, prices fell 0.1 per cent after a 0.2 per cent monthly drop in May.

Kim Kinnaird, director of Halifax Mortgages, said the large annual drop reflected the comparison with a peak in house prices seen around a year ago, with relatively little movement in prices over the last few months.

But rocketing mortgage costs – spurred by rising expectations for Bank of England interest rates as it battles inflation – pointed to weaker months ahead.

“How deep or persistent the downturn in house prices will be remains hard to predict,” Kinnaird said, adding that falling inflation could offer some support.

“With markets now forecasting a peak in Bank Rate of over 6 per cent, the likelihood is that mortgage rates will remain higher for longer, and the squeeze on household finances will continue.”

Investors bet on Thursday that stubborn inflation would force the Bank of England to raise interest rates to a 25-year high of 6.5 per cent by December.

Lenders, including Lloyds Bank (LLOY.L) subsidiary Halifax and other high street names, have repeatedly re-priced home loan offerings in recent weeks in a scramble to keep up with soaring funding costs.

History suggests housing market activity is likely to slow sharply.

Big increases in swap rates – which underpin mortgage funding costs – often precede large falls in housing starts, according to a Reuters analysis of the last 35 years.

Halifax said the drop in house prices was largest in the south east of England. In London, prices fell in annual terms by 2.6 per cent, the biggest decline since October 2009.