If it were me I'd put on angle beads on all edges, pva the whole thing, put a very thin coat of bonding, pva again and skim.
You have bookcase there too though which makes it a bit akward to do, maybe you can get away with just the front and without angle beads... a pro will advise!
You buy bags of multifinish, bonding, and hardwall plaster.. You can probably get away with just using a couple of coats of pva, but I have a habit of having a thin coat of bonding plaster - gives me more time to put on the multifinish (as I am a DIYer)
Thanks Alastair. I appreciate the advice! What's a good ova to use. I looked it up on the builders depot website and there's a veriaty of ova at a big range of prices
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