I have had to remove a radiator and its brackets from a wall that
required re-plastering. I have no idea where the screw holes were for
the brackets. I had left the screws in the wall but the plasterer
removed them.

I am now faced with the task of putting the brackets back in the right
place.

My idea is to put the brackets on the radiator and hold in place with
tape. Fix some short nuts and bolts in the holes in the brackets and
dab the end of the bolt with paint. Loosley fix the radiator onto the
valves then carefully swing the rad up to the wall so that the painted
bolts leave a mark. Remove the rad from the valves, drill the holes
fix the brackets then hang the rad.

Has anyone tried this or have any better ideas for re hanging a
radiator?

Many thanks
AndyP