While the system cost around £160m to set up in2002, it generates significant revenue every year, which is invested inimproving the transport network. In 2011/12 Congestion Charging raised around£137 million to be spent on other transport initiatives within London.
More top news
Ex-London mayor Ken Livingstone says he is sorry for the "disruption" caused by his comments that Adolf Hitler was a supporter of Zionism.
Kickstarter group asks for public donations to fund replacing Tube ads with pictures of cats
Sir David Attenborough opens Woodberry wetlands in Stoke Newington