Range from the cheapest Fit a radiator £40 (APG Assist Plumbing & Gas based in W5) to the dearest Fit a radiator £170 (ThePlumbers.org based in TW7).
Comparing heating engineers estimates for Fit a radiator gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for removing and replacing a radiator in your home by posting your job to heating engineers in Kew.