British Pathe has created a website with many, many hours of film.
Sadly much of it is behind a paywall, but there are some 'freebies' including an excellent account of 617 Sqn Dambusters and Tall Boy raids.
https://www.britishpathe.tv/#/catego...ry=history#top
Destroying the great dams of western Germany, using a very special weapon designed by scientific genius Barnes Wallis, made the RAF’s 617 squadron one of the most famous in the world. This film features rare archive film and photographs, fascinating Interviews (newly-filmed and from the IWM archives) and illustrative 3-D graphics.