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Cheers. Didn't realise these existed. I've only seen the wedge(?) shaped ones.
You're right, I'm glad I saw it. I'm a bit prang about the cables in the trunking/wall now. But I'm almost certain this is from the excess wires being crammed in the box to keep them tidy till I got to this job.
Decided as they were being connected to the supply I'd cut them off.
When I wired the other socket I came across a good college tutorial where the dude said, although it was counterintuitive, it was easier to fit longer cables in a box than shorter ones. I tried it his way and found it much easier than the time before. He said length of the box + 70mm.
I've also decided this is a daylight job, so will hook it all up tomorrow. Will make it quicker too, as an amateur I find all the careful measuring up, trimming, etc. to be the longest part.
hugo7-
It's pretty much the same for professionals. You do get quicker at it though, especially getting the screws back in for the front plate.
The training I had they suggested the width of your hand poking out of the box. Hopefully you've put rubber grommets in the holes the wires pass through, that's a requirement and can save a lot of problems.
Another suggestion the teachers I had made was to bend over the end of the conductor as it makes it much less likely to slip out of the connector when you tighten it. I don't do it but it does work if you find that a problem when you're wiring sockets and switches.
Airhead
Electrical tape or cut and join it with a straight Wago.
[https://www.tlc-direct.co.uk/Products/WA2411.html?
Good that you spotted it though, they can cause shorting issues and shocks in some cases.