We have a shed about 3 metres from the back of our house that we want to run power to for lights and sockets. Is it permitted to wire this as an extension from a socket inside the house as a spur? Do I have to run SWA cable? Inside the shed i will run a RCD with wiring for 2 2gang sockets and a tube light (or similar). What kind of wiring etc do I need to purchase and if anyone is in shropshire want to give a price for doing the work I would be interested in hearing from you.