The Royal Institution of Chartered Surveyors warns that if you can't get insurance for your house, you're in big trouble. Mortgage lenders won't lend on houses that are uninsurable and as a result its value could fall by up to 80%.

It's a high flood risk that's most likely to make your house uninsurable. According to a recent survey, 6.5 million homes are already at risk from flooding of which 1.5 million are in high risk areas. The government has completed flood defences in many such areas and protection for a further 80,000 homes is due this year. But concerns have also been expressed about a further 120,000 new homes planned for the Thames Gateway which are potentially in a high