I was researching around the Planet of the Apes stories to see what other things I’d missed, and I came across this spin off which was made after the original film, and after the TV series. It has a different view of the ape culture where the apes are more sophisticated and have a higher technology culture than portrayed in both the films and in the TV series. Apparently this is more in keeping with the original book, which I’m sad to say I’ve never read! I must put that right soon though.
So I’m planning on getting hold of this at some point soon, although possibly after I’ve watched the whole of the TV series.