I was so unhappy with Dominion that for 7 years subsequently it drove me away from reading any of Sansom's books. Later I found his Shardlake detective novels set in the reign of Henry VIII proved to be a great deal better. I feel in this article, Wallace has picked out the main flaws with the book. Sansom really uses it to beat down Scottish nationalists and as if that was not enough in the story itself, he has an essay at the end to try to drive this home. Given how Scottish nationalism has manifested as sitting to the left of the Labour Party, portraying nationalist guerillas running around the Highlands more like Tito's partisans would have been a more feasible line. His desire to make a political point for 21st Century Britain distorts the story and the regime change he implies seems to come from nowhere.
As often seems to be the case with successful authors, this book is under-edited. There is too much info dumping; too much has been 'borrowed' from SS-GB. The resolution is incredibly weak in that we do not see what happens to the main characters but find out a lot about minor ones. It seems that he expected to write a sequel, but sensibly this was not permitted. He also makes a number of blunders. The prime one is German access to uranium. He believes they had to somehow get it from the Congo, whereas the moment they took over Bohemia-Moravia, they had a great source of uranium. We also know that in our history, where they did far less well than in this alternative, they had constructed a 'dirty bomb' by 1944, so them building an atomic bomb by 1952 seems highly likely without needing US secrets.
I am very tired of people making the default assumption that Lord Halifax as Prime Minister must have meant a British surrender in 1940/41. People do not read up anything about his attitudes, especially post-March 1939, German invasion of Bohemia-Moravia. I feel that given people now feel content to shoot down any discussion of Operation Sea Lion, we must start doing the same with this view of Halifax. It is very lazy. People seem to have no awareness that someone who has been shown to be a fool in one regard, is very assiduous in not repeating their mistake. Come 1943, Halifax would have been right behind unconditional surrender and probably something like the Morgenthau Plan for post-war Germany.
There are numerous petty errors such as the D.Phil/Ph.D error and for some reason relocating the German Embassy from Prussia House to Senate House, and more obvious ones like people shopping on a Sunday as if it was the 2010s rather than the 1970s, let alone the 1950s. There was no Ministry of Defence in 1940, it would not appear for another 24 years. Developing movie film of someone's parents in 10 minutes to show their son on a projector, also seems ridiculous. These were easy to check things if he had just bothered to look, let alone had talked to people. There are still quite a lot of people around who were adults in 1952. I feel that Sansom was simply arrogant. He wanted an excuse to hammer the SNP by making their forefathers appear as if they would have been Nazi collaborators. He could have done that in so many better ways than via this book which is disappointing because he really wasted an opportunity.
If nothing else Dominion reminds us how we are held to account on every minor error we might write in our counter-factual history stories and novels, but an author from outside the genre, because he is well established is permitted to get away not only with a whole sequence of events, but lazy research and simply poor writing, with impunity.