Pete,
Thanks - due to this thread I was able to ID W/C Craig - other senior officers have been possibly ID'd e.g. ACM Guy Garrod, GC Collard...
There is a clip of a female 'celeb' signing one of the Lancs, SW313 TL-B, in the US. Not sure if is was Dorothy Lamour...
There are four reels in total and maybe they have got mixed up in the years as reel 3 seems to be shot at Graveley (airfield code "GR" is in the foreground of a wide shot over airfield) and appeared to be cover the squadron leaving there for RAF Stradishall (?) yet reel 4 jumps back to San Antonio Air Depot and more shots of the crews on parade in the US.
The Lancasters certainly looked impressive in their white finish and must have been quite a sight flying in formation across the USA.