Mention of Mercedes F1 near Oxford puts me in mind of the motorsport "golden triangle" or "motorsport valley". The area between Oxford, Banbury and Milton Keynes contains Mercedes, Lotus, Caterham, Williams, Red Bull and Force India F1 teams. March Engineering were also up near Banbury as well as Prodrive rally team in Milton Keynes. Oh, and not to forget Aston Martin are based in Milton Keynes too.
Almost. Grove, where the Williams Team is, isn't quite in that triangle.