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Probably best just to use a junction box to extend the cable to a new socket. It might be wise to check the Zs but that requires a fairly specialised tester.
Not my most useful answer ever! probably worth revisiting in a workday.
If you already have 2 x 2gang sockets it suggests a ring. You can check relatively quickly but its not that easy to explain how.
Airhead-
junction box
The more I read, the more this looks like the easiest and cheapest solution.
I seem to have a million and one other projects stacking up, plus work, plus a toddler. Plus with C19 and WFH I'm loathed to cause any damage which will require calling people out.
Today our boiler sprang a leak for the 2nd time, so also having to organise the emergency callout stuff on that. Definitely glad we paid the extra £30 or whatever it was for that!
hugo7
Cheers.
The fuse box is in an adjacent brick outhouse. Idk for sure whether it starts there or is feed off the main outhouse room, but the wires come out of the outhouse, under the ground, into the shed and through the conduct.
I like the idea of another socket, but given that there are a total of 4 sockets (2 x2), and idk how it is supplied / feed(?) just moving that one seems safer.
NB. in the last pic: left = double socket , right = double socket , up = light and light switch