Perhaps you might contact the US military veterinary clinics located on RAF Lakenheath, RAF Mildenhall, or RAF Fairford. I'm certain that they'd be able to help you find pet owners who brought their pets over and placed them into quarantine. Perhaps Quinn will be able to provide the telephone numbers for the first two locations.
In case you didn't know, it was made official last week that the pet passport program has been extended to include the US and Canada. We live in Germany at the moment. But my two dogs have just had their blood tested 6 weeks ago so that if we do get orders to England in March 2004, we'll be able to take them along with us (after getting some local certificates and treatments).
If England was still on the 6 month quarantine program requirement from EU countries, there would be no way this side of hell that I would ever consider moving there with my dogs. I already have a neurotic bitch....long term confinement would just compound all of her problems :(
hth -- good luck with your research
toodles