Range from the cheapest Fit a radiator £100 (G&H Gas and Heating based in SE6) to the dearest Fit a radiator £220 (Dulwich Plumber based in SE13).
Comparing heating engineers estimates for fitting a new radiator in SE13 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 SE13.

"We need to fit 2 new radiators in a different location within the same room of the original location ( living room) "
BR1