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 alternative forms of payment.
However, if you're willing to pay the required costs (which I'm guesstimating comes to about US$17.50 for 50g, plus international shipping charges), it can be ordered, in bulk, here: http://www.mysmokingshop.co.uk/index2.php?mod=mancats&sec=2464&man=325. As far as I can tell, it isn't available tinned at all.
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.
UPDATE: I've e-mailed the retailer regarding alternative forms of payment. I'll post back what I hear.
Bob