Who collects maps and what are they worth?

Tim Bryars, who is one of the organisers of the London Map Fair, talks to the BBC about the sort of people who collect maps, why they are so interesting to collectors and how much they can be worth.
Mr Bryars, who also co-runs a book and map shop in London, shows off some of his favourite maps in his London shop.
- I filmed and edited this for the BBC. The piece was filmed at the Bryars & Bryars shop, Cecil Court, London.