Taken from his myspace page:
They say there's no such thing as a free lunch. Maybe so, but you can get access to 15 totally free live tracks if you sign on for my website newsletter. The tracks, encoded as high quality MP3s for downloading, are from my concert at Salisbury City Hall in 2006, with ex-Faces and Small Faces keyboard maestro Ian McLagan.

Register here for his newsletter: www.billybragg.co.uk/register/

The first issue you receive has 15 songs from a 2006 show.