I really like this book, it's quite informative. The author doesn't want to make a point and claim Arthur existed or not, but gives an overview of ancient texts, trying to piece it together, and gives his own ideas. Mike Ashley, however, is possessed by dates, which can be quite exhausting to read (and remember...). There are, admittingly, pitfalls in dating. For example, does "year zero" start with the birth of Jesus? His baptism? His death? At the end of the book the author gives an overview of 20 possible candidates who might have been Arthur, or who might have been the basis for "an" Arthur, ranging from Lucius Artorius Castus to Athrwys ap Meurig. Between these two there is a time scale of about 500 years...
Nice touch at the end as Ashley asks us, the readers, what our conclusions are.