I was programme assistant on 'Beat City', the documentary about Liverpool filmed at the time and showing performances at the Cavern and other places of Rory Storm & the Hurricanes, Faron's Flamingos, the Chants etc. There was Ferry 'Cross the Mersey. Oasis are now considering making a film of the last days of the Beatles.
I have tried for nearly 20 years to get film-makers interested in a feature film of Mersey Beat, recreating what the scene was actually like. A film company said yes, but felt the scope was so big it should be a TV series. We got the no. 1 British TV writer involved, who knew the scene then and lived below John and Stu in Gambier Terrace. The film company placed the project with the BBC, who said they were interested. They held onto it for three years and then took the name and used it for a tired, unsuccessful cop series.
This sort of practice with TV channels is quite common I'm told.