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Don’t think I’ll be able to get filler to stick to the rear plasterboard. I could glue some lolly sticks but, at 20mm, it’s not easy to even get a finger in there to fix one in place.
Current plan is to place a dab of expandable foam to the rear of the plasterboard on the other side of the cavity then use that as backing for the filler.
Soul
NotThamesWater
If I had the bits on hand, gluing some lolly sticks behind the hole at least stops it all falling out the back. A bit fiddly tbh. If you can get the filler to hold and don’t mind doing a couple fills that might be the most straightforward.