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What needs done? Are you supplying the rads? For context in South London (I've had two radiator jobs done recently);
Fitting a towel rad. I supplied everything and removed the old rad. Plumber needed to shorten one of the pipes and bend both out slightly as the towel rad sits further out than the old panel one. Bit of cutting soldering, draining down the heating system, hanging the new rad on the wall, fitting all valves, refilling heating system and testing - £145
Swapping 3 TRVs, again, all supplied by me. Two were not connected to rads and one was. Draining system again, draining the single radiator, swapping valves, re-filling and testing - £160
So it probably depends on the amount of work needed, how much actual plumbing work is there (as opposed to just screwing on valves), how much the guy can be arsed to do it etc.
Is it me or is £750+ VAT expensive to fit three small radiators?
None of my three trusted/usual cabal of Enfield-based plumbers can do it before our floor sanders arrive next Thursday and this is the first guy I've found who can fit them in time.
If this is the going rate I might DIY instead...