The book "Bomber Intelligence" by W.E.Jones, who was the intelligence officer at Hemswell, states that the briefing part of the film was made on 9th. March 1945 after cancellation of an operation just before briefing.The Base commander, Air Commodore Cozens,made use of the cancellation to make his film sequences including a briefing session.
Station Commander at Hemswell was G/C W.C. [Wally] Sheen DSO.
170 Sqd. Commander was W/C Templeton-Rooke.