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I'm pretty sure I've got some bags of it in the basement somewhere. I've used it as a filler, but never tried to put it on with a float as a wide and thin layer.
Don't want to sand it if I can avoid it, so just wanted to bosh on a decent fill but any time I've used toupret, it handles slightly differently to plaster or easifill.
Nef-
Tricky one, why has the current plaster blown?
I do use easifill to fix this kind of problem but usually its on a plasterboard patch. I've seen mixed comments about PVA from plasterers although I do use it when I'm filling deep plaster chases I don't tend to with multifinish or easifill.
TX110 is pretty good at this kind of thing, small downside is cost. You can avoid sanding by letting it dry a bit and finishing it with a sponge. Either TX110 or Easifill will allow you to feather it in and smooth it off with a sponge. TX110 works ok as a thin layer too.
Airhead
My bet is he'll recommend Toupret TX110 https://www.screwfix.com/p/toupret-toupret-tx110-expert-rapid-drying-interior-filler-2kg/19358
Sounds like a pretty big patch though ...