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Closest you can get without sign off is an outdoor socket and temporary wiring (i.e. extension cable), if, and only if you have a socket inside the house which you can directly connect a socket to on the outside wall by drilling through the back of the existing socket and installing the outdoor rated socket over the hole. That socket needs to be RCD protected and strictly speaking you should carry out all the appropriate checks when you install it but it's just within regs as long as there is no permanent exterior wiring involved. So in short there's no way to make a proper installation out of it. Also bear in mind that by fixing an extension cord to the fence you would be making it permanent wiring so that then falls under regs. Its a bit of an odd one but really the cost of getting it done properly in armoured is worth it if you want a serious workshop, otherwise maybe an extension cord would work for you.
Is there a way to run power to a shed with dealing with the cost of regs? Can I have a perm camera running in it? And obviously with power for tools, lighting, hearing and whatnot?