Any recommendations for a good bike maintenance service in London (NW1)? It would make my life easier if someone could call round every month or two to look over my bicycle. Changing the chain and realigning the gears seem to need doing fairly often. It's kept in a bike hangar so I have no intention of ever owning a bike worth more than about £500. It doesn't really work for me to take it to a bike store as then I have to walk home and have no bike for a day, so best if a mechanic could call round. If he has to take it away, that's a problem too, as it will take too long. And parking is a hassle, so he has to cycle here really. Or maybe the idea doesn't work and it would be better to get a new bike every couple of years?