Could anyone tell me generally how much it would cost to run mains electric to a garage. It would start in loft, suspende outside to top of and through garage then down inside. Another route is from loft, down outside wall, under block paving through then up inside garage wall. The garage is 11 feet away from the house with about 30 feet of cable. Would the former be lower 100s and latter be in the upper £100s?