OK, I need a quickish answer really, as need the problem rectified ASAP! Just got a quote of £2200 to have 10 radiator panels with thermostatic vavles fitted along with the plumbing of completely new copper piping over 3 floors for my shop/flat above. Also included in the price is the replacement of a pressure release valve on my combi boiler. Is this a reasonable price? Basically, I have a modern high capacity combi boiler mated to a prehistoric central heating system(30 years old wouldn't be far off!), and it need a repair every year, so this is the long term solution.