Factual error: The film states that the 42nd blockade is located on the M602 motorway, 27 miles outside of Manchester. The M602 is 3.4 miles away from Manchester at its farthest point and is barely three miles in total. It is a very short motorway. It only has 3 junctions. The filming location was actually the M1, outside Milton Keynes.
Visible crew/equipment: On the shot of Jim walking across Westminster bridge there are visible crew/members of public on the right of the shot at the end of the bridge. (00:09:30)
Answer: The metric system is used in mainland Europe, but very rarely in Britain. Road signs are still measured in miles in Britain, and distances usually are too.
He's My Brother