Excellent work, explains everything, nothing too much trouble, fast, reliable and on-time, tidy, and courteous. Highly recommend Martin & John.
Installed a new combi-boiler, dealt with moving the location of the boiler which meant putting a hole through to outside and sealing off old vent on 4th floor. (some quotes said scaffolding would be needed) Also concealed piping very neatly in the wall - a must for aesthetics for a new kitchen build. Boiler positioned meticulously where a new kitchen cabinet will be built. Removed old water tank from the roof, took out a shower pump that was no longer needed, re-routed piping, installed an easy to use, wireless temperature control, ... etc.
Since it went so well I asked for two old radiators to be replaced, which they did in the same timeframe. So glad I did.
Very friendly trustworthy guys. Everything working perfectly and on time to fit in with the kitchen works.