This is a lovely hour presented by Len Goodman 'The British Ballroom Story' on BBC4 on Thursday. A feel good programme.
I've been to several of the ballrooms he mentions like The Orchid Purley, Streatham Locarno, Hammersmith Palais, The Lyceum and the Cafe de Paris.
http://www.bbc.co.uk/iplayer/episode/b0 ... oom_Story/