I've not seen this before, the first 40 mins or so are an edited version of Night Bombers narrated by David Savile (he played the First Lieutenant of HMS HERO in the first 3 serries of 'Warship' on the BBC in the mid 70s). Although the link to the original documentary of 'Memphis Belle' isn't in the hour long Night Bombers on YouTube (see below)
http://youtu.be/eqQAA2rcBno
Perhaps this was aimed at the viewers in the US
The second documentary is I think "Lancaster Legend" made by BBC North in 1980 (see below)
http://youtu.be/2tH8OVAICjQ