If you haven't seen the London program get it on the I player while you can- in addition to the folk stuff there is an excellent section on Music Hall and a rare chance to catch John Foreman singing "The houses inbetween".

I've seen it now and there's just so much good stuff in that programme, BBC4 at its best. On top of everything else that's already been mentioned there's the English electric eccentrics of Ian Dury and a very austere looking Ray Davies, there's Lord Kitchener and the Empire Windrush, there's a reminder of the delightful coincidence (or Peter Ackroyd-ish historical resonance) that George Frederic Handel and Jimi Hendrix lived in adjoining houses ... and Eliza singing with Mawkin, Spiers & Boden, Lucie Skeaping singing a broadside ballad, etc etc. Top stuff.