It is probably over the top, but depends on the radiator - they supply, and fit, is it an extra radiator, or a simple straight swap. Get other quotes for the same job.
The quote states "The radiator to have a new thermostatic valve and a new return valve". I'm not sure why - the radiator needs replacing because it has sprung a leak in the middle of the bottom edge, nowhere near the valves.
About the only benefit of swapping to a combi would be a bit of space saved, but you lose your airing cupboard. Any potential Gas saving will take many years, (if ever) to pay for the cost of the alterations.
You say the Heating is working ok, the issue is with the Hot water?
The quote states "The radiator to have a new thermostatic valve and a new return valve". I'm not sure why - the radiator needs replacing because it has sprung a leak in the middle of the bottom edge, nowhere near the valves.
Indicates the issue is probably not with the boiler and changing the pump may not help matters. I would look at a possible circulation issue, (sludge build up), before spending money on new parts you probably don't even need.
Radiator leak may also be related, it's a sign the system could be corroding from the inside out, in which case adding a Combi and pressurising the system could open up a whole new can of worms!
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