There's a forum for it on fertilityfriends, I'm pretty sure. British women usually prefer CRM's sister clinic, Reprofit, in Brno, because there are direct flights from one of the London area airports to Brno. But you could fly into Brno, and it's about a ninety minute drive, I think, to Zlin. I made a friend from Wales there when I cycled; she didn't want the long wait for Reprofit and came to Zlin instead (I have twin boys from that cycle; she has twin boys from a later cycle). Now, the donor coordinators select your donors in the Czech Republic, and it sounds as though donor selection is important to you, so you may have already written off Czech clinics. But if cost is important, Zlin is also a very affordable choice.
If cost is less of a consideration, I know that GIVF in the Washington, DC, area markets heavily in England.
http://www.givf.com/specialfeatures/outoftownpatients.shtml They actually got negative publicity when they held one of the usual donor egg cycle raffles that they use in the U.S. as a marketing tool, and that got translated in the U.K. press as they were raffling off an oocyte. Anyway, I don't know whether they are actually affiliated with a clinic, but they very likely are, because I'm pretty sure they are either affiliated or actually own a clinic in China. But they're pretty expensive; I started there, but ended up in the Czech Republic when the bottom fell out of the stock market a few years ago.
Also, I think Shady Grove, also in the DC metro area, has started marketing itself internationally.
http://www.shadygrovefertility.com/out_of_area Shady Grove would be a more affordable option, at least if you do a split cycle.
GIVF had a very nice donor pool when I was a patient a few years ago. I've heard less attractive things about SG's pool, but an acquaintance has two beautiful DE children from that clinic. The nice thing about the DC area clinics is that if you haven't been to Washington before, you could do some sight-seeing and enjoy the trip, too.
I don't know whether importation of donor eggs from the U.S. is legal, although I've wondered about the legality of international oocyte shipments before. One issue would be whether the British clinic would have adequate facilities and training to thaw and fertilize vitrified eggs. Egg vitrification is still technically an experimental therapy in the U.S., and that might have some bearing on the legal issues, too.
Good luck!
Maggie (in VA)