Ultralight Outdoor Gear stock them. They're an excellent super-helpful outfit and though web based they have a warehouse/shop, if it's near enough, where you can try packs. If not it's order and send back if you don't like .
YES, own the new granite gear Blaze and despite the fact it has less padding than any other ruck I've used (except golite) it is THE most comfortable pack I've ever used. Ofc it may differ with your own body shape, neverless I highly recommend you try one.
Upstairs we have a Gregory Z55. I'd say it looks pretty comfy. Roos uses it and finds it very comfy. I, on the other hand, find it hideously uncomfortable (and it's the right size for me and everything). I use an old Lowe which I find very comfortable, and a fairly old Macpac which I find almost as comfortable. A pal wanted to borrow a pack and tried on each, found the Mac was the comfiest she'd ever tried and couldn't abide the Lowe. It's all down to your particular shape and its relationship to the pack's harness.
So try before you buy if at all possible, or at least be prepared to send it back.
Have to agree with peter although the low weight, adjustable back size and hip movement the blaze allows should help with all body shapes. Always check the returns policy before buying a rucksack though.
According to the GG website, UOG is the official UK distributor. So, I don't think you'll find them anywhere else. You could email UOG and ask if they do distribute them to any other sellers. They're usually good about responding to emails.
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I can only find one supplier for Granite Gear in the UK. Is there any other than 
