Here's something I just ran across: a photograph of an apparent battle between police and demonstrators against the introduction of the means test in Bristol in 1932.
Click for a larger version, where all kinds of interesting details become apparent.
This, and a number of other interesting photos, available at the Mirrorpix blog, which sadly seems to have gone a bit quiet.
(This reminds me of a rather different--though equally interesting--street scene that I referred to last year: a police film of street betters in Chesterfield in 1935. See a fascinating episode from the birth of the surveillance state!)