In the 1969/70 British television series UFO, several scenes suggest that the SHADO Headquarters are located in southern England near London, for example when a UFO lands in “southern England”, “right on our own doorstep” in Episode 11 The Square Triangle.
However, Commander Straker and other characters use left-hand-drive vehicles and drive on the right-hand side of the road; though in some flashback scenes, cars are driving on the left-hand side.
What is the reason for these apparent contradictions? Were cars supposed to drive on the right-hand side of the road in England in the future (i.e. 1980)?