Unfortunately I read this novel in parallel with "Eminent Churchillians" by Andrew Roberts, and I was left with the strong suspicion at times that Roberts' chapter on the Tory Party was almost being cut-and-pasted into the Dobbs book.
The anachronistic dialogue irritates (did high civil servants in the 1930's really use the f-word continuously?), but the explanation of the Churchill succession to the Premiership is certainly ingenious. The minor characters seem rather to lose their way, and to be tidied up at the end almost as after-thoughts. Dobbs might have skipped some of them and given us a bit more insight into the minds of Joe Kennedy and Beaverbrook, who are presnted as one-dimensional ogres. Cleverly, JFK appears in a non-speaking part.
Guy Burgess emerges as more interesting than I had expected, but Dobbs has actually attributed some of the stories surrounding Tom Driburg (also a cameo appearance) to Burgess himself - a bit lazy, really.
It's a bit like "Jesus of Nazareth" in a way, because we all know how the story ends before we finish the first page. So full marks to Dobbs for keeping us engaged to the end.
But please don't imagine that reading this book gives you any special insight into Appeasement, Norway and the Fall of Chamberlain - it's good fiction for the beach, quite well researched, but modern history it ain't.