I had a look at Marks Models site, but I don't seem to be able to add to cart, it just gives the option to be notified or to contact them. I filled in my contact details, but haven't heard anything back from them yet.
EDIT: I filled in the contact section again, as I just remembered that yesterday when I tried, my work pc was giving trouble with the 'captcha' bit, and I couldn't submit the request - it worked fine for me today, so I'll wait to hear back from them now.