TfL says persistent offenders owe more than £700m in Ulez fines

Non-payers of London’s ultra-low emission zone have been fined up to £17,000 this year. Photograph: Yui Mok/PA

Transport for London is promising to crack down on drivers who flout its ultra-low emission zone (Ulez) after revealing that 94% of the £790m owed in fines has been racked up by persistent offenders.

Non-payers have been fined up to £17,000 this year, including one driver whose car was seized and sold at auction after he ignored 130 warning letters and 14 visits by enforcement officers.