There's a brief loop at the entrance to the 'London before London' gallery in the Museum of London at the Barbican that might be of interest. It attempts to show the growth of 'London' from the Mesolithic through to (I think, from memory) Roman times.

Quite interesting and attention grabbing - it's a large wall installation right at the entrance to the gallery. A nice open space, with a small bench, it gives a good background introduction to the contents of the gallery - putting it all into context so to speak.

I've not found it on their web site yet, but it might be there.