Please see picture of the inside of my bathroom and one of the outside.
I have just banged a couple of holes in the landing wall ready for an electrician to fit a couple of switches for a new bathroom fan.
My banging popped the tiles off the bathroom wall and some of the plaster came away
What can I use to patch up the damage on the inside; one coat?
Also, I'm trying to place the metal casing in the wall for the switches (the hole is far bigger than is needed), what can I use to hold the casing in place? Can I sort of bury them in one coat?
Thank you very much.