Beagle,
No worries- I knew what you meant!

As you know, the Celts covered the whole British Isles, but were isolated in the "Celtic fringe" of Wales, Scotland and Ireland by the Angle, Saxon and Jute newcomers. Those in Cornwall migrated over the Channel to kin-groups in Brittany, which is when the term "Great Britain" came to be used for the main island, and "Little Britain" for Brittany.
We don't have any firm evidence for when the Celts arrived in the British Isles, except for Bede's story of the Egyptian Princess & the Scythians, which we can safely put down to wishful thinking. The first evidence of the Celts in Europe comes around 1000BC-ish, with accounts of traders visiting Britain centuries later. Interestingly, none of these accounts refers to "Celts", but I would assume that they would have settled in the British Isles by this point.
As you know, most hillforts in Britain -or at least in England- can only be dated to the Pre-Roman Iron Age, all resistance having been squashed by the Romans after that. Those in Scotland mostly date to the Late Roman Iron Age, with many being re-used in the Dark Ages.
Those in Ireland are a bit of a puzzle; not only is there no archaeological evidence of a
Celtic invasion, there's no evidence of the Romans doing anything more than occasionally visit for trading purposes. Add to that the Vikings building
Longphoirt at coastal settlements after 795 AD, refortification due to tribal warfare through to the Norman invasions (and after), and there's a whole mish-mash of forts.
Guess we'll have to wait until someone finds the Celtic equivalent of the Rosetta Stone to tell us the
whole story....
