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Don't tell anyone, but I just have a very long single extension lead from the outside weatherproof socket (also on our kitchen ring) into the shed, but taken up high and carefully routed/cable clipped to avoid damage etc., with a multi-socket bar plugged in to that inside the shed. I definitely want a more permanent/approved set up with its own CU but I'm realistically careful about not leaving anything plugged in, not overloading it etc. There's an armoured cable waiting to be connected at both ends when the electrician comes for a bigger job!
How do you connect it to the extension lead? Just stick a plug on the "input tail" of the shed CU?