It's the problem you find with having an older car, the phrase, "Sorry Sir, it's No Longer Available" I've become acustomed to it every time I go to the local VAG garage. But I don't expect the same for tyres, particularly when I only bought a set 2 years ago.
So, looks like I have to change brand. Dunlop Sport 2000 is the one's I can get in the size and speed rating. What's worrying is the comments on that link above, not many seem to like 'em