Truck drivers have been issued with more than £5.2 million in fines for contravening London's Low Emission Zone.

But because many of the fines were scrapped on appeal and others were discounted for prompt payment, Transport for London is set to generate only about £1 million from the scheme, which was launched in February by Ken Livingstone.

More than 5,200 fines of £1,000 were handed to drivers caught entering the zone without paying the £200 fee levied on "dirty" vehicles. But TfL scrapped more than £3 million in fines because some operators were unable to fit special emission filters in time. Others saw their penalty cut to £500 for swift payment.

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