When the main character drives his BMW convertible, you can see at one point that license plates of a truck are mirrored. That proves that the BMW was actually a left-hand driver and equipped with mirrored license placed, so that mirroring of the final scene would produce a UK-style car.
The mansion of Andy's family at the beginning of the film is actually the Jenisch mansion located in Hamburg, Germany. Half of the film supposedly was shot in Germany, the other half in the UK.