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From my varied reading, only when it is connected directly to the main CU on it's own circuit (which I would absolutely get a spark to do and sign off/condemn my shed bodging), not when fed from the 13A socket. Again, happy to be pointed to the regs that say otherwise. For context, EICR passed 6 months ago and the spark installed the weatherproof socket at that time, so I'm confident it is fine.
There's a lot of information out there but most of the sparks or DIY forums descend into full garage door condescension or outright insults when similar questions are asked.
Re: the temporary shed CU set up. I am more buoyed by reading and realising that caravans etc use a similar set up for hooking up to the mains. My plans are as follows;
The above would only really be a fancy extension lead set up really, with the CU/RCDs being a bit redundant as the whole thing is coming off a 13A plug on the MCB/kitchen socket circuit anyway (external, weatherproof socket outside the kitchen).
The long term plan would be to run a proper SWA cable off it's own circuit out there and then upgrade the socket MCBs if I want to run something beefy or a heater or something. Having everything already in place at the shed end will hopefully make it an easy swap. But this won't happen until the kitchen is done.
I could just use an extension lead full stop until the full cable is run, but having a separate light switch and sockets on the walls would be nice from the get go, and I get to play around with where they are best placed. I can then keep the extension lead by the back door, plug it into the external socket and unspool it as I walk down to the shed, plug the CU tail in and it's ready to go.
Unless of course someone can tell me this will bring a pox upon my house and damn me for all eternity.