I have been using Nicholas Brandon-Trehearn( 020 8697 5393/07958 431434) since he was recommended on this forum back in 2007. He still comes regularly and does a good job. I think quite a few other people also use him as a result of this forum too.
Approached a guy who was cleaning windows in Tyers Gate this morning who did my windows a couple of hours later. Very pleasant guy who did a good job but he's only here once every 3 months unless he gets more jobs.
right but still a little research can be done.. i always research the professional services before hiring them... and not only by asking some people on forums.. i like to be informed as much as possible :)