Flying sequences using large-scale model Lancasters were shot at RAF West Malling in Kent. One of the radio controlled models crashed during filming. An article in the local press dated 24 May 1971 gives the reason for the crash as "interference from a local radio station". The article is accompanied by a photograph of special effects man Eric Faulkner carrying the damaged model Lancaster across the airfield. Avro Lancaster PA474 was also used in the filming of the show. Prior to being transferred to the care of 44 Squadron based at RAF Waddington in 1965, for conversion back to WW2 condition, this aircraft had appeared in two feature films: Operation Crossbow and The Guns of Navarone.