London's cycle hire scheme has been running since 2010, and has expanded a lot since then.
Two maintenance depots repair and manage the distribution of bikes around London. We went to have a look behind the scenes at the Penton Street depot, near King's Cross.
One thing we love about the scheme is that it's the only form of public transport in London that's 'open' on Christmas Day.
Read more on the scheme:
A rare sight insdeed: All three colours of bike in a row