
Your best approach would be to one of the4 Pug dog breed clubs. You should introduce yourself, and give the pedigree of your bitch, and some references regarding your suitability to buy a puppy. This is not to be insulting, but to send a puppy abroad any good breeder would want to know you personally, or be assured that you are the sort of person they would sell a puppy to, especially as once it has left the country, there isn't a lot they can do if probelms arise.
contact the Kennel Club on their website
http://www.the-kennel-club.org.uk/, or Phone Tel 0870 606 6750 and ask for Pug club secretaries details.