My 10+ year Glowworm boiler had it's annual maintenance and all clear in October undertaken by my regular plumber, but as it continued to make occasional noises which sounded like a helicopter, I contacted Dan, the recommended local heating engineer on Glowworm's website. It turns out my old boiler had been leaking for some time and had other issues. Dan installed my new Glowworm boiler as well as undertaking the necessary remedial work to comply with regulations in one day. While installing the new boiler, Dan had noticed damp patches round the cold water tank in the loft. As it wasn't clear at first where the water was coming from, a couple of adjustments were made and over the next days the situation was monitored. By Sunday late afternoon, the water had started to discolour and lift the ceiling paper in the bedroom below. Dan came round without hesitation, was able to identify the issue and over the next hour, stopped the leak. I highly recommend Dan, he is friendly and approachable, keeps you informed and explains what is going on. Dan is methodical and very professional and the fact that he is prepared to deal with issues on a Sunday evening makes him exceptional.