Hi again :D
So I've moved on to the window, where the plaster is not in very good condition. When I touched the section to the right of the window, it seemed that a very thick layer of plaster was moving, which was cracking the skim. I realised that this problem would only get worse if I just papered over the cracks, so I chipped off the section that moved and cracked. The worst part of the damage is smaller than my outstretched hand but bigger than my palm. I am already putting a couple of extra screws in the angle bead, but I will need to get something under the bead.
I was going to patch up the corners with Easi-Fill anyway, so am I going to be able to get away with several layers of Easi-Fill again?
Thanks in advance

should be ok, provided you layer it as you say, give it a lick of pva first (2:1 water:pva)...

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Thanks CW. I'll let you know how that goes.

Hi, I'm back. I applied some pva like you said, but the landlord shoved some quick cement in the hole. I scraped some off and layered up the Easi-Fill, building up the corner because the bead was showing. Time to start undercoating next...
Big thanks to all