Not sure how to tackle this

[noseall]

Thanks John. So would you unscrew the sockets, make good and then rescrew back on the wall once set?

You need to remove the switch fronts yes. Grinding in can be risky on a painted wall as the paint starts to flake off the more you wet it and agitate it with the trowel. You also need to grind in or feather in whilst the muck is pliable, because where it becomes thin and brittle it can flake off on the peripheries as it hardens.

 

[John D v2.0]

turn off the power of course first, then remove the sockets, ideally completely and roll the wires out of the way, but take a photo first of the wiring. Then yes make it all good without wires flapping around and then you can put it all back.

 

[noseall]

P.S. thistle multi feathers in better than board finish.