By Charlie Conchie House prices dipped unexpectedly for the first time since April this month, but a closely watched survey today suggests that the outlook for the property market is likely to strengthen as interest rates are reined in. In its closely watchedhouse price index today, mortgage lender Nationwide said British house prices slipped by 0.2 per cent in August despite economists expecting the figures to rise. Analysts polled by Reuters had forecast prices would rise by 0.2 per cent on the previous month. In annual terms, prices were 2.4 per cent higher than in August last year, the fas…