Found this while whiling away a lazy sunday, pretty decent and detailed documentary with some interesting information in it.
http://www.channel4.com/programmes/the-celts/4od
As far as i know this will only work if you live in the uk so sorry in advance for the people who can't watch this.
ps Ignore the the fact that it says there are two episodes its really only one thats been put up twice.
Bookmarks