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.
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This was also the year when home technology raised its game.
Over-running engineering work caused major disruption to rail services on some of the busiest routes in the country on Monday.
Man who has barricaded himself in house for three days may have a stash of petrol and other explosives, police say.