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

Transport body promises to crack down on the small minority of people with four or more penalty notices

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.