Range from the cheapest Fit a radiator £90 (Peter Phillips based in DA7) to the dearest Fit a radiator £200 (Gas2Loo based in DA2).
Comparing heating engineers estimates for fitting a new radiator in DA2 gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes. Radiators vary in price, and additional hours will be required to make pipework changes.
What to do - Get rates and quotes for removing your old radiator and replacing it with a new radiator by posting your job to heating engineers in DA2.

"Replace and fit a radiator "
DA1