London's congestion charge could rise by 15%. Transport for London is considering an increase from £10 to £11.50 on the standard daily charge.
Transport for London says the daily charge has not risen since 2011. Increasing it would generate an estimated £84 million of additional revenue by the end of 2017/18.
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The mayor took time out from City Hall to join Conservative party workers handing out leaflets in Uxbridge and South Ruislip.
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