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That will be too deep for polyfila just get some mortar and it should be fine.
Hard to tell how deep it from the pic. Most builder would use grip fill or expanding foam if the client is not present. And skim it jobs a gooden mate.
wildwest-
just get some mortar and it should be fine
This is where I'm a bit wary - previous builders have mixed and matched modern with old materials willy nilly, and there are problems everywhere with damp because of it.
And although this is on an internal wall, it is an internal wall where damp exists, and I don't want to exacerbate it.
I may end up stripping of the top layer of gypsum plaster (which looks like it may come off in one piece) and giving it a finishing coat of lime plaster.
Which means, I guess, I just need to fill the hole with lime plaster & hair mix, then finish with a rough skim coat.
NotThamesWater
Plastering repair question - I'm digging out trunking (that contains a mix of coax & badly splice mains cables...) and am stuck on how to patch it up.
The problem is that it is brick (from a previously outside wall), covered by lime & hair plaster (with no lath), and then skinned with something, and then skimmed with gypsum plaster.
So do I just fill it with modern gypsum plaster, lime plaster, or a combination of both. Or just polyfilla. Or just hang a painting over it.