www.bbc.co.uk/iplayer/episode/b09gtbh2/blitz-the-bombs-that-changed-britain-series-1-episode-1
Absolutely excellent. Incredibly moving at times too. 400 people were killed in London on the first night of the Blitz, and it went on for months after that, night after night. It's almost unimaginable now.
I really liked the way this programme got relatives of people who were bombed to read out their diary entries and look at the archives.