+1 for Blue Mountain, which McClelland is changing it's name to Balkan Blue (due to some copyright issues).
Not really sure if it's considered an "English" blend, it's quite oriental forward for me, but I've been enjoying Magnum Opus A LOT lately.
Penzance honestly isn't all that hard to find (or wasn't for me, maybe I got lucky), as long as you're willing to do a bit of google searching for various tobacconists around the country and placing a few phone calls. I spent about half an hour looking, and 3 phone calls later, I had a pound!