The term 'Celtic' is always problematical, which does affect the rating for this series as it examines Iron Age Britain, which is a very different thing from the title's claims.
Oliver is an engaging presenter, even though his habit of talking over his shoulder often provokes betting as to when he'll finally trip or go over a cliff. Until he does, we'll be treated to access to some very interesting sites. We're not envious, oh no. Well, a bit.
This dvd covers what is really mostly Iron Age Britain, offering an examination of the cultures present in Britain at the time. Having watched both the original Ancient Britain show on the BBC as well as this one, there has always been a good deal of information presented. These shows are not designed for archaeologists, they're designed to appeal to people for whom history is either Days of Yore or Olde Tymes wherein people wore and ate mud and communicated in grunts. If these shows can give people even an inkling of the skills developed by Iron Age peoples and the heights to which they took their art, then it's done its job.
Academics wrestle endlessly over terms that are used for cultures, 'Celtic' probably has occupied more than its share of the papers presented, opinions shouted and people unconvinced by any of the many sides of the arguments. What is true is that 'Celtic' is a term of romance as much as anything else, but it's one that draws people in, and the ones who want to learn more can be converted to the side of Right Terminology. The rest might not care, or might just have learned a bit from the shows. That's never a bad thing.