Nearest petrol station to Luton airport?

[GreatGooglyMoogly]

Anyone know the nearest petrol station to Luton airport, if going from St Albans on the M1? TIA.

There is one at Asda on Wigmore Lane, about a mile from the airport (if its not too late)

Thanks wkft - it turned out there was one right by the rental car place at the airport!