A socket in our bedroom seems to have been installed poorly in the first place. On one side, it seems quite secure – the screw is going into a rawlplug at the back that's securely anchored. But on the other side there is nothing for the screw to go into, just a big hole. The hole extends around the edges of the socket this side too.
I suspect I could fix this myself using pre-mixed filler (though please let me know if there's a better way!)
However, my main question is – Am I allowed to do this myself in the UK (England, to be precise), as it's around an electric socket?
Is this the kind of thing I'd need to call in a certified electrician to do, to avoid invalidating house insurance etc? To be clear, I don't think there's any actual wiring work needed, just the filling.
(This looks superficially similar to Repairing wall around a plug socket but the hole is deeper and also it's the safety/legal aspect I'm most interested in.)