I placed an order last Wednesday and today they arrived. They are stunners. They can be pumped up to 95 psi - a little lower than my current Marathons and they are a little thicker in profile however with looks like these, I can live with that. In addition they have a special layer that helps to prevent punctures. These tyres are a special edition, released to coincide with the London Olympics and when they are sold out, that's it.
A few friends who have then fitted to their Brompton bikes, swear by them. I suspect that I will eventually fit them to my beloved Orange Brompton once the worst of the British winter is over - assuming I can resist the temptation of having these rather gorgeous tyres fitted to my Brompton!