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That would be notifiable as you are making a change to the CU, but I don't see why it wouldn't be possible. Lower rated MCB (16A) at the CU and double check the cable size. Just because it was running a shower, don't trust that it is correct unless you put it in yourself. As @Airhead said, it would likely need to be 2.5mm2 to be able to safely run power to the sockets without overheating, especially if it's going through/under insulation. You'll likely want to make sure you've gotten rid of any potential switch line to the shower too, lest you end up making that live when wiring up the socket.
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I've done something very similar. In my case it is the feed to the old immersion and there is a 15A fuse wire in the fuse box (I believe the term consumer unit is a lot younger than the fuse box that circuit is on).
I fitted a single gang 13A plug as that was what there was room for. Annoyingly the back box had machine screw threads that don't match the current ones, presumably imperial, so I had to swap that too.
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stevo_com
jellybaby
@yafe
So I have some isolated wiring in my loft that used to power an electric shower that has been removed.
It currently goes down to a 40A breaker on my RCD unit. I'm never going to refit an electric shower here so would prefer to repurpose the cabling to add a plug socket to power lighting and network equipment in the loft space.
Can I power a single double gang plug from its own breaker if I lower the fuse rating?