No doubt that's a very well written book. The narrative just flows and you can read really fast that almost 1000 pages seldom needing to reread a sentence because it was poorly constructed or difficult to understand. In that respect, hats off. Just admirable.
Moreover, logical reasoning behind grand events of European history are very well constructed. 1789, 1815, 1830, 1848, 1871, 1914. The big picture Thomson generally evolves his ideas around is the whys and ways of preserving a "concert of Europe". Cruciality of this, I mean the "concert of Europe" as a teleological target gives a bit of Whiggish flavor to his understanding of history. Under that spell, he reads many events as triggered by opportunist interferences of some belligerents, banking on the motivation of other players to balance the concert with compromises beneficial to the belligerent. While doing that, one feels he attributes to the UK, especially after the second half of the 19th century some sort of singularity as an exemplary democracy, acting always in prudence and in general interest of everybody, meaning the concert. Absence of a structured explanation of this behavior should be the major drawback of the book. Nevertheless, many times his deductions are just brilliant and still is worth reading.
Although a bit weaker than the other parts, his examination of post-WWII still offers interesting insights.
Lastly, I'm amazed by the printing quality of the book. OK, occasionally there were pages with characters blurred by the overflown ink but the leaves themselves were so nicely bound together that the book never showed any inclination of falling apart although the leaves were very thin (but still not mirroring the page behind), leading to the illusion of the book having half the actual number of pages.