LONDON: British house prices in May were 3.5% higher than a year earlier, monthly data from mortgage lender Nationwide showed on Monday, after an unexpected 0.5% monthly increase largely reversed a fall in April.Economists polled by Reuters had forecast a 0.1% monthly increase and a 2.9% annual increase.The seasonally adjusted monthly increase was the largest since December, while the annual gain was the second-smallest since October, after April's 3.4% rise. British property sales surged in March as buyers sought to complete transactions before the end of a partial exemption on...