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I’d be heartily surprised if doing it properly was only half a days work tbh.
40amp breaker isn’t really appropriate unless it’s a supply circuit to a new board with its own lighting and socket circuits (and this notifiable work as pointed out by @jellybaby ).
You’d definitely want to test all those circuits properly as well, which you won’t be able to do unless you have a multi function tester and experience testing.There are ways that you could maybe do it to make it not notifiable but it would be doing it in a hokey way to try and bend the rules, which wouldn’t be wise in my opinion.
Nef-
Thanks. I am going by three electrician quotes I have already had. Two of the three wouldn't bother with a CU in the shed, opting for a beefy fused spur (like you get for cookers), and no one was willing to bury the cable, saying they'd pass it on the floor behind some planters. One of the three said they'd install a ground spike and a CU.
Even if it takes more than a day, 2 grand is crazy money.
Invent
I have been getting some quotes to extend an existing unused 40A circuit 10 metres to my shed for a few sockets and a light. If I did it myself it would cost me about £150 in parts and about half a day's work. But electricians are quoting me over 2 grand to come and do the job.
As it is a modification to an existing circuit it is non-notifiable work but I am hesitant to do the job myself from a liability perspective despite having done a lot of simpler legal electrical work (changing sockets, lights, adding outside socket etc) on my home before. What are people's thoughts on this kind of stuff?