Here in the U.S. there's a free service (paid for by the various utility companys) called Free Finder. We call them and within 24 hours someone comes out and locates all of the various utility lines and marks there locations with spray paint color coded to the various kinds of lines... electric, gas, cable T.V., etc. They would rather bear the cost of location than the cost ofr repairing and funeral expenses... Surely there's a similar service in the U.K., no?