Cycling is on the increase, because it's good exercise and has a wholsome green image. And if you live in London, where the number of cyclists has nearly doubled in the past 5 years, you can give more than a little credit to the Congestion Charge as a prime mover in getting commuters onto their bikes. And even the Government is doing its bit by offering tax breaks through a Bike to Work scheme. see www.cyclescheme.co.uk
Mountain bikes with innumerable gears led the charge away from the old 'sit up and beg' design, but the fastest growing part of the market now is said to be the folding bike, which has obvious attractions if has to be stowed away in minimal space when not in use.
for online bargains at police and government auctions of lost and stolen bikes see http://www.bumblebeeauctions.co.uk/XcAPViewInCat.asp?ID=24
for everything else you need to know about cycling in London, events etc- see http://www.tfl.gov.uk/roadusers/cycling/11682.aspx