Tony Vaccaro on this evening Newsnight

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While you're there, The Photographer's Gallery is very close (and much larger), has free entry in the mornings, and a really good bookshop:

You could spend a whole day visiting photographic galleries in London. The V&A always has some photography on display and will be opening a new Photography Centre in October:

Proud Galleries often have something worth seeing:

There are frequent photographic exhibitions at the Barbican Gallery, NPG and Whitechapel Gallery etc., as well as a bunch of other specialised photography galleries I must get around to exploring: