Following a large number of complaints from drivers that they had been sold “contaminated” fuel, trading standards officials have today launched an investigation. The complaints centre on south-east England, with drivers believing that they may have been sold petrol containing ethanol, which has subsequently damaged their cars, causing juddering, misfiring and a loss of power.  Retailers including Morrisons and Tesco have been in the firing line, although both say that so far they have carried out tests and have found no evidence of contamination.