Any particular filler you recommend? Or fillers to avoid?
Ideally after filling, and curing, and sanding I can drill again (this time deeper) and put them back in the same spot this time with more stout fixings.
I would like to avoid drilling through to nextdoor though!
It's definitely breeze block with plaster.
@Polka_Dot... Needs filling and sanding then some bigger fixings. I'd suggest something like this.