This is a tender, generous movie that likes its characters and presents them as real people, full of flaws and strengths.

As somebody who had not heard any of this before, it became a curious phenomenon to sit and watch a film and slowly have the realities begin to click into place.

This is a must-see and one of the best documentaries - and films - of this year.

It's simply great fun, a winsome film and an occasionally over-the-top luxury fantasy that never flags.