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@Airhead will probably have better tekkers, but I'd be tempted by epoxy like konstab said.
This seems fairly expensive:
https://www.screwfix.com/p/fischer-fis-v-hybrid-mortar-resin-360ml/88507This is a bit cheaper:
https://www.screwfix.com/p/rawlplug-r-kem-ii-styrene-free-polyester-resin-300ml/32863 -
I would try the same as absurdbird. Even pine might do it but there are a few considerations hence 'probably' also.
A standard filler that handles deep filling and would be secure after a few days is Fibarex from Toupret.
Nef
Airhead
@Lolo
It's a 6mm, about 50mm deep hole. It's just a few mm to where it should be. I just want to make sure that when I drill the new hole the drill bit doesn't move to the softer filler (since the concrete is very hard).