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It doesn't look all that easy to access and it's pretty small so I would go expanding foam. Although I would pack it with wire wool and/or some steel mesh as well just in case to put off any rodents.
If you do this a top tip is to wear at least two pairs of gloves as expanding foam is fucking sticky and you might need to mush the wire into the foam a bit.
Edit if there is some sort of ventilation requirement then just fitted wire mesh pushed to shape and then no more nails + some screws
hugo7
Got this hole to the outside world in the attic.
Just wondering how to fix, I’m not sure that wall has a facia at all so maybe that’s the issue? It’s a small bathroom extension. Plumber who went up into the attic suggested expanding foam, but that sounds like a bodge.
No rain gets in as the tiles overhang. And it’s not causing any issues but don’t want any birds or wasps coming in (there is already an old wasp nest in the attic).