Hi Pete,
Unable to run the clips as I'm at work at the mo. I think it was the 30 min film I did you, with a spoken intro by Tony Verity, and then straight into Byron Lee & The Dragonaires doing Jamaica Ska - am I right?
If so, this has the second "End" logo with the applause. To me, it looks like it's compiled from two separate films as they look like they've been filmed on different occasions. There's certainly a difference between, for example, Prince Buster doing "Wash Wash", to Byron Lee & The Dragonaires doing "Sammy Dead" (not the Eric Morris clip at the start of the film).
The alternative ending, which ends with I Don't Know by the Blues Busters was shown on BBC2 in June 1986. If you run through the clip on your vid again, you'll probably notice that after the bad editing of split-second dance clips, it fades out into Sammy Dead.
Thankfully, I still have the film as part of my pride and joy of my video collection.
Confused? You bet I am mate!
Gene