They're made by a company called Sovella. I do some work for them now and then, and I've got a bunch of their stuff knocking around. PM me if you want a couple/few shelves and you can have em for free.
Actually, now I think of it, I've got to pick up an eBay purchase in Purley tomorrow evening - that's near you, isn't it? If so, I could even drop the shelves over to you.