American Civil War Graves in the UK

This was an interesting item on this week's episode of BBC Radio 4 series Making History Part of the synopsis reads:

Michael Hammerson is researching the lives and last resting place of Britons caught up in the American Civil War who returned to the UK.
His initial interest lies in the graves of American Civil War veterans in Highgate Cemetery in North London  but he would like Making History listeners with American Civil War ancestors to get in touch.He would also like to hear from those people who know of other American Civil War veterans’ graves here in the UK. Please contact Making History and we will pass on your information to Michael.

There are also links to a PDF version of a fascinating 8-page leaflet he has written about the graves in Highgate Cemetery, and to a podcast of the whole show (which can also be downloaded from iTunes).

That's quite some project he has taken on, and I wish him well. I've never come across one of these graves, or any references to them, but if I do, I know who to tell.