I enjoyed the earlier chapters although the foreshadowing of The Big Reveal became a bit repetitive and the coverage of events in the Debatable Land under the Tudors and early Stewarts, as the borders between England and Scotland came more into focus, felt rather drawn out. The chapters on the Scottish Referendum and Brexit felt like articles tacked on at the end.
As for the big reveal? Well, I would have likes more insight into the competing theories as to the identity of legendary King Arthur, and the key maps that underlying the place name and Ptolemaic Map analysis needed to be larger scale and would have been better located in the relevant chapters – true for all the maps at the back of the paperback.
Publisher page: The Debatable Land – Graham Robb