Paul and Ringo were both in it. They spoke to George about WW2 - Ringo about the blitz and Paul about George's service. they both spoke about The Beatles too of course! Michael Palin chatted about George's comedy work, especially with Spike Milligan and Peter Sellers.
It was a very good programme, I thought. Basically George Martin chatting about his life and work to camera and with a few people (Paul, Ringo, Michael, his wife, Giles, Howard Goodall [about Beatles and Eleanor Rigby in particular]). Also a couple of artists he worked with just spoke about him (Jeff Beck, America, Rolf Harris, Bernard Cribbins, Cilla Black).
Lots of Beatles stuff. Not too many new stories, but the chance to see Paul and Ringo chatting to him was interesting. Clearly still friendly and grateful to George for allowing their ideas to come to life and adding ideas to their sound.
All in all, George Martin came across as a talented, charming and good natured guy. Although now 85 still active and mentally clear. Well made programme too.
PS - tried not to give to much away for those that haven't seen it yet!