It has been found on a farm in Surrey. http://news.bbc.co.uk/1/hi/england/6930684.stm How the hell did it manage to get back here, but at least the is procedures in place now.
It must be near impossible to completely stop any disease from entering the country, even more so with animals, but like you said, at least they have the procedures in place. The 3km quarantine and then the 10k observation area seem like a good step.