And it's the little details, the Liverpudlians confined to quarters during the action, the parallels with the Russian Revolution, and the dismantling of "it can't happen here" in one short vignette.
The bugbear I have with James Philips is his use of info dumps which seem like they're in place purely to fill space. I don't need the back story of every incidental character whenever they first arrive. Airey Neave's escape from Colditz gets an average of five mentions per book it seems.
I only really know of 1, (the other is one that I'm not entirely sure is completely fictional), which is the 10/24/1962 series by James Philip. All bar the newest ones are on Kindle Unlimited.