I am quite familiar with "From Scythia to Camelot"
(I have actually got into a few heated debates with its co-author Linda Malcor
on many occasions on the Arthurnet Mailing list).
Suffice to say, I find their conclusions to fall
well short of the mark. They too often display a woefull lack of knowledge in
the realm of Celtic linguistics and ancient Celtic history (despite the fact
that Malcor studied under the Celticist Patrick K. Ford, who she now seems to
disagree with on most points concerning the development of the arthurian
legend), often overlooking or dismissing important Celtic evidence that might
weaken their thesis. While I do not believe that Celtic literature evolved in a
bubble, Malcor an Littleton go to the opposite extreme, accrediting the Alans
and Sarmatians with having virtually overfaced any native legendry (there merely
conced that Gwenhwyfar is Celtic out of the vast amounts of themes which they
otherwise attribute to the Scythians).
-C. Gwinn