Had a new central heating boiler (and timer/thermostat controller) fitted, the old hot water tank removed as it was no longer needed, and changes to the pipework. Chose them as it was the most suitable and most impressive out of three quotes (it was the middle price of the three), included a more powerful boiler than the other two quotes, which I liked, and offered me the names and phone numbers of previous customers who I phoned for references, which were good. Was very good work including good advice and design - they seem to very much know what they are doing. He said "don't pay until you're satisfied" but I made the mistake of not taking up this offer: I paid as soon as the work had been completed even though some of the holes in the wall hadn't been tidied up on the final day because they had to leave promptly to pick up children from school etc, and it then took a long time to get them back to sort it out - I probably should have not paid until everything had been finalised, as he had said. Subsequently they have done annual services of the boiler and system, safety checks of my gas cooker, a repair to the gas cooker, and re-plumbing of the washing machine. They have given helpful expert advice above and beyond the work they have done. Also I once phoned early on a Sunday morning because of a boiler breakdown under warranty and got a quick response. Have just occasionally had problems with them not turning up when agreed and not being able to make contact to find out what was going on - or not getting responses to requests for work - phone messages and emails not being answered, or promises of getting back to me not being fulfilled unless I keep trying - and it took several years and several requests before I managed to get the Building Regulations Compliance certificate for the boiler installation. This admin side would be my only criticism. I put it down to the fact that most plumbers tend to be hard to pin down, and MPHS are much less bad in this respect than many other tradespeople. It hasn't happened often and usually I get very helpful responses. I have recommended them to friends who have had significant work done and have never experienced any such problems - the friends have all spoken very highly of the work they have done.