That's a shame, sorry gents.
From what I can remember: we see the aircraft drawn out of the hangar at Felixstowe, sideways on rails - kind of interesting, it's so big they have to wait to attach the rudder and elevators outside; a loading sequence; then it's in the water and takes off; interesting for me to see after often reading that the larger machines were better at handling heavier seas. Then, a fair length of in flight film, from both within the craft looking out, and from an accompanying plane. Finally, a landing. All kind of nice, because on film the type turns out to have been a more elegant plane than I'd imagined only from plan views and static shots.
Various other details others might pick up on. I'm just surprised and glad that film of such an obscure and forgotten type actually exists!
Mark