k1w1k1d:
"but over the last 12 months the plastic around the screw to the wall has cracked/broken"
Possibly the screws were over tightened putting excessive pressure on the plastic. They should have lasted a hell of a lot longer than "6-7 years".
You should be able to see a brand name on the switches if you have a good look at the back of them.
Was that $60 for just the power point, or was that for supply and fitting?
The brand was CHiNT. I see its available at Placemakers for $20.98 in 2019. I paid 200%+ over that 8 years ago.