All I can do is just add to the praise and recommendations. John came round a few weeks ago to give me a quote for a new boiler and I was very impressed with how many small details he spotted and how well he explained what he'd need to do. (The quote was also way better than the British Gas equivalent, and for a higher-spec boiler). He came back with Dan yesterday (yes, Bank Holiday) and they powered through, getting the whole thing done in a day with no fuss, cleaning up perfectly afterwards. Again, he was very good at explaining what was going on, and gave me a few tips about unrelated problems in the flat. Great guy and very easy to get along with. If you do get him and Dan in to do some work, though, make sure you have plenty of biscuits because they don't even stop for lunch.