@macaroon. Thanks,helps to type out what I think I need to do!
Another probably a daft question for a DIYr , but is there a good way of knowing how much of the existing stuff to remove? It seems fairly stable but when tapping a little hollow sounding suggesting it's came away from the brickwork. I guess it's probably original plaster from the 20s when the house was built. Figured the tiles didn't fall off the wall beforehand so it can't have been failing entirely.
I'd leave it if it's solid but hollow sounding. If the plaster has gone "mushy" then I'd remove those patches and replace. You could end up plastering the entire room otherwise.
as above, I've used bonding without PVA plenty of times, works fine. It makes more sense with a skim coat though.
@macaroon. Thanks,helps to type out what I think I need to do!
Another probably a daft question for a DIYr , but is there a good way of knowing how much of the existing stuff to remove? It seems fairly stable but when tapping a little hollow sounding suggesting it's came away from the brickwork. I guess it's probably original plaster from the 20s when the house was built. Figured the tiles didn't fall off the wall beforehand so it can't have been failing entirely.