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skinny
Sorry, that would have helped, wouldn't it!
On zooming I can see that it's not just a brick out. It's actually been cut out. So correct fix is remove what looks like 2 bricks and then mortar them in.
Also in the plan is to knock out the stud wall to the right, and then build a new insulated stud wall to the left, to bring all of this void into the thermal envelope.
I think your idea of bin bag or similar filled up with expanding foam could be a good idea. It'll very quickly fill the hole to prevent drafts for right now, and then be easily taken out later when I want to do the right fix. Thank you!
It's an old house with lime mortar, and I've got some pointing work to do elsewhere. I've told myself it's a job for the spring once the weather is better, though. I'll probably do this at the same time.