Thanks Neo. That saves me another question! I have, in the past, pulled up onto a garage forecourt the proud new owner of a shiney new (used) car, only to look a numpty as I couldn't open the petrol cap.
Options:
a) Wait for someone else with the same make/model to pull up onto the forecourt and ask them
Phone the guy you just bought the car off (risking a b********* of the attendant for using a mobile phone) and ask how to complete the simple task!
I went with option b
no problem