I've finished reading Britannia's Fist by Peter G. Tsouras. I've been trying to find an email address for the author so that I could tell him how awesome it is, but to no avail.
Tsouras was an Army intelligence officer and a military historian, and it shows. The back of the novel is actually a full set of endnotes for his sources, both real and fictitious. It was a nice touch.
The story, in which Britain enters the American Civil War after the Laird rams controversy gets ugly, is meticulously researched and quite realistic. I await, with trembling pleasure, the sequel.