You could buy them from one of the American dealers (
https://www.summitracing.com/dom/sea...illocation=dom )
and take advantage of the free shipping to get them to someone with a container heading overseas. I think Issah/Jim Burril mentioned today on the forum they have a container about to go over. Toss them a little towards the shipping, and that way the tires will make it over to the Uk, so you are just looking at domestic shipping from there.
I put a set of those onto the C15TA here at the museum. They really look the part.