Apologies if this has been posted before...I tried a search, honest!
I last saw this several years ago on Channel 4 in the UK, and have tried to find it several times since. I happened to find a link earlier and thought others may be interested.
Night Bombers Video Documentary at FactualTV
Starts with an advert, but the film is all period colour and almost an hour long. Watched only a few minutes so far. It all looks so recent.
Cheers!