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

It's the kind of movie you'll want to see a second time with someone who hasn't seen it yet, to remember what it was like to watch it for the first time.

A film of deceptively outspoken contemporary relevance, this is cinema at its most alert, alarming and alive.

It is encouraging that the film ends so strongly.Otherwise, it wouldn't have been a particularly memorable film