Where you've been buying 'faulty' fuel

• The map is a snapshot of where people who contacted the BBC News website say they bought petrol that led to engine problems
• The website has received several thousand e-mails and texts from motorists complaining of problems with their cars after buying fuel
• Initial reports centred on petrol bought at Tesco and Morrisons forecourts in south-east England, although both companies have said no fault has been found with their fuel