BP - Old Stratford Road, Buckingham, Buckinghamshire MK18 1NY 2

BP throughout Streetview here. Richard says it used to be a Mobil before BP bought out that brand, and looking at the underside of the canopy, that's clearly the case.

www.google.co.uk/maps/@52.0025091,-0.9828775,3a,74.5y,166...

Done