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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-
Two of the three wouldn't bother with a CU in the shed, opting for a beefy fused spur (like you get for cookers),
That’s what I’d envisioned as a workaround, but it’s not ideal in my eyes. Can’t say for sure if it’d need an earth rod - that’s down to what your Zs readings are (making sure the resistance of the circuit in an earth fault condition is low enough to trip the breaker within the required time - more resistance = slower trip time).
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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
This sounds an awful lot like something you could replicate with a £20 extension lead.
Actually I don't quite see how you could run a light switch off a 40A spur without something functionally equivalent to a fuse box in the shed.
Nef
grams
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.