I'm already thinking...

Sounds fun, but I honestly don't think I can offer anything on this one.

I'll have to have a bit of a think about it but Georgette Heyer's Infamous Army is one, considered accurate enough to have been used in Sandringham.

Ooh, Conan Doyle's White Company novels, the ones he wanted to be remembered for.

I'll definitely do a post for this tomorrow!