Thanks lads.
Just finished fitting the electrics this week with the old chap.
Ran a three core cable from the consumer unit in the house, under the upstairs floor boards, under the landing window into a weatherproof box outside. Then ran an armoured cable into a small consumer unit in the outbuilding. Inside I've now got two double socket plugs and a couple of strip lights which should be plenty for me to run a chest freezer, electric heater, kettle and any other power tools A proper electrician in coming round tomorrow to have a gander and make sure it's all safe before I switch i