Found it!

For a decent price from Abebooks.

Picture from Amazon UK

I last read this in the early 1980s. I can remember devouring it in the sun in my parents' back garden one summer. Prices have been over the top whenever I've looked on line, at least as far as I'm concerned, but it's worth spending fifteen quid on including postage.

For the uninitiated, Lord George Sackville was the commander of the British cavalry at Minden, 1759. When ordered to attack he refused, and the opportunity to turn victory into triumph was lost. He had some (half) plausible reason*, but nevertheless was found guilty at a court martial the following year and stripped of all office. He somehow later regained favour with the new king, George III, and, under the name Lord George Germain, rose to become Secretary of State for the American Depratment in 1775. So he ended up being a baddie on both sides of the Atlantic.

* at least that's how I remember it from reading the book before, and his earlier service showed no evidence of cowardice.

The book, when it arrives, will no doubt lead me to hanker after armies for the western German theatre in the SYW. Redcoats will make a nice change, and I could get away with using some Prussians as Hessians and the like. And the French will come in handy too for Rossbach, so it'd be good value really. I'd probably have to do the Reichsarmee then too, but at least that will bring some much needed colour to the Bourbon-Habsburg alliance. Then I'll be just about complete for the SYW.

...mind you there's the Swedes, Spanish and Portuguese to think about...