This is a clip from "Act of Valor" a film made by the British government in 1946 about the fighting in Arnhem, Holland in September, 1944. The film was made with documentary footage from the battle mixed with scenes shot in Arnhem area in 1946. It shows that at that time the U.K. owned a few Panzerkampfwagon V "Panther" medium tanks they must have confiscated after the war ended. They would be worth quite a bit today.
Later in the movie there are scenes with PzKw VIa Tiger I's which would be even rarer.