British house prices fell less than expected in June and at their slowest annual rate in 11 months, the latest Halifax survey showed on Wednesday, but the mortgage lender cautioned prices would stay volatile this year. Halifax said house prices fell 0.5 percent in June for an annual rate decline of 12.5 percent, the slowest since last July, and it said there were signs the market was stabilising. Still, June's fall reversed a 2.6 percent rise in May and contrasted with figures from rival mortgage lender Nationwide last week, which said house prices rose 0.9 percent last month. Coming after other data showing the jobs market decline slowed and shop price inflation continued to ease last month, the figures highlighted the degree of uncertainty on where the economy is heading after suffering its deepest fall in 50 years.