The main thing that was different with this programme was tying the account in with Neil Faulkner's archeological excavation in northern Norfolk. This is a site which is in the right area, and dates to the middle of the first century AD, and so it of the right period. But there was nothing presented in the programme to directly tie the site in with Boudicca. What this actually served to demonstrate was the way in which archaeological material and historical material tend to answer different questions. The study of the site, interesting though it was, didn't really help tell the story of Boudicca.
Not as bad as the Battlefield Britain programme on the subject, but not as good as Michael Wood's from nearly twenty-five years ago.
Edit 19/07/2007: Okay, yes there is - Tacitus, Agricola 15.