This is plasterboard or something with a void about an inch back
This is the wall plug
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The hole here is actually so big that the wall plug would fall through into the void if I put it back
I can't move the radiator up or down or left or right because it is fixed and even if I knew how to disconnect it I wouldn't want to spill black water everywhere and ruin the carpet, so I am thinking I should use the same holes but get a bigger plug
What about the plastic ones for plasterboard that sort of butterfly out when you fix them in?
Get molly anchor
Also called a toggle bolt in Burgerland
Removed by mod
And Yorkshire.