I've posted this at the end of another long thread, but thought it might be useful to repost here, since I'm going in a slightly different direction from that earlier discussion.
For anyone who is looking for a blend very close to Stonehaven, I've just discovered this one: Germain's Rich Dark Flake. Germain/Esoterica say it is the closest thing to Stonehaven you can find.
Here's the less-than-good news: It is not sold in the United States. I did find a UK retailer (link below), but there is a note at the bottom of their page stating that, due to credit-card restrictions, they cannot sell tobacco to the U.S. using credit cards. I'm not sure what work-arounds there might be, but they do supply an e-mail address for inquiries. It sounds like they're willing to come up with alternative forms of payment. I've e-mailed them about this and will report back what I find out.
It's also worth pointing out that going this route won't be cheap. Rich Dark Flake is only available in bulk, and prices are listed here: http://www.mysmokingshop.co.uk/index2.php?mod=mancats&sec=2464&man=325.
I realize this isn't like pointing you to a C&D or McClelland blend that is identical. But it's an option, if you're really really motivated to try a near-equivalent.