This is plasterboard or something with a void about an inch back
This is the wall plug
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?
I think you are right there's no stud where the hole is, but the drywall itself has to be anchored to something. Depending on how the radiator is hung up you might be able to move the anchor or drill a new hole if it's like a plate running lengthwise
Oh thanks I will double check, I've got very little wiggle room in terms of moving it about but will try