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Protesters say mayor Ken Livingstone does not want to hear their complaints

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Protesting cabbies hooted their horns and sirens

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Trevor Dacas, a cab driver of 11 years says "charging the same fare for carrying one person as carrying two, ain't right"

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Mark Powell, a cab driver for 18 months, said: "It's a ridiculous situation when Ken don't listen"

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Traffic built up around The Mall and Admiralty Arch

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Sharon Rouillon, a cab driver of six years, said "not being able to use bus lanes around Trafalgar puts �2 on people's fare"

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Bemused tourists in Trafalgar Square looked on

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After an hour the police moved the drivers to ease traffic