Premises that are frequently flooded can install blood barriers - in outline heavy duty impermeable membranes kept in trenches at the foot of walls and plugs to go in the drains - flooding looks likely you stretch the membrane up outside the walls and clip them up. It costs about £30,000 and may necessitate reinforcing the walls, depending on the depths and so pressures likely to be found.

But it does result in still being able to get insurance and maybe sell the property!