Annual house price growth halved in the UK last month, as economic uncertainty caused by conflict in the Middle East continued to deter homebuyers.The average price of a British home rose 0.8% in the year to September to £274,251, according to Nationwide. That was half the rate recorded in August, when house prices grew 1.6% year on year. It also marked the slowest pace of home price growth since December last year.House prices across the UK fell 0.2% month on month, after taking account of seasonal effects.The housing market has...