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Funny enough there is no problem running an extension cord in the garden, anything not fixed is classed as a temporary extension. If you need a socket in the garden first then you can get away with going straight out of the back of an existing socket through the wall. It needs to be on a circuit protected by an RCD (any circuit near a garden door should be RCD protected anyway). There are things you are supposed to check when doing that but in principal if there's no exterior wiring to the socket then it doesn't need signing off.
Not sure why you need a fuse box in the shed though, an extension cord has a max 13amp fuse in it anyway.
Airhead-
OK - that makes it sound like it should be doable to extend a cable from the existing outdoor socket, which is RCD protected. By doable, I mean I'll be able to call a chap to do it.
I don't know why I need a fuse box, I probably don't - someone mentioned it to me once, and I know nothing about electricity.
christianSpaceman
Ok - thanks for this. I'll live with an extension for now, and get an electrician in when we have some work done in a couple of months.
You sound like you know what you're talking about. Given a socket in the garden (in a waterproof box), is it possible to run a cable off that to the shed and then have a little fuse box inside the shed on the end of that cable. The alternative would be I guess to run a cable from the main fuse box to the shed, but that would be much trickier to route.