I chose Mark from J H Glazing to replace a new upvc sliding sash window in my first floor flat which had been left only partially in place, unsealed, with part of the original box sash still in place and the wrong fittings on it. He turned up promptly to do a quote, listened carefully to what I wanted, produced a very competitive quote quickly. I had to delay the work for a few weeks due to dealing with a death. He was very understanding. He worked on his own, was quiet, considerate, efficient and cleaned up. It was an awkward window being on the first floor and behind the kitchen sink. The weather was cold and windy with short daylight hours in the first week of January. Mark managed to salvage the original wooden architrave and cill, which had some damage from the previous window installers attempt (no other company said they could do this). I have repainted the architrave and cill and, with the minimal fittings in satin rather than shiny chrome, and it now fits in very well with both the kitchen and the other two windows which are still the original wooden sashes. The work is FENSA certified, has an Energy Performance certificate and guarantee. Mark kept to his quote and is very competent and pleasant. I highly recommend him.