That reel of film on Footage Detectives yesterday is a heavily edited version of The Radio Caroline Story, Paul Kramer Productions, 1965, no credit given. Has been available online at the East Anglian Film Archive, and on You Tube for many years, Full 9 minute version, background and credits.
https://eafa.org.uk/work/?id=2365

Talking Pictures TV introduction included a photo of the Ross Revenge and Ronan promoting Caroline TV with Mike Read saying that he didn't know whether that had gone ahead. Edited version then ended suddenly and TPYV went into adverts.