I was expecting three hours of viewing paintings; maybe there would be descriptions and opinions.
What we get is much more. It is a real documentary about life in London's National Gallery. I can relate as we have a local (Kimbell Art Museum) and took part in similar activities.
Do not get me wrong, there are plenty of pictures and discussions. They are just part of the overall experience.
You will come away feeling that you are part of the gallery staff and participated in decisions. It is the next best thing to being there. And the three hours presentation in its casual form will leave you wanting more.