I think you will be lucky. My brother in law has two cars. A scenic (petrol) and a '04 plate vectra estate (diesel ) He went to local Tesco superstore in his vectra and spent £70 on shopping and got a 10p a litre off fuel voucher. He decided top put some fuel in the vectra on the way out and put £40 worth in. As he put the pump nozzle back into the pump he realised he had put £40 worth of petrol in instead of diesel. He didn't attempt to start the car and pushed it over to a parking bay on the forecourt, went to pay for the fuel, and rang the AA. After some discussion with them he agreed to pay £175 for them to come out and pump out his fuel tank. Apparently this is becoming a common occurence and they have specialy adapted vehiciles to pump out the wrong fuel and take it away. This they did and he then was advised to fill up with diesel straight away. Turned out to be a bloody expensive shopping trip!