I don't know any Yorkie kennels in the UK. I would suggest as there are some excellent breeders in Thailand, that you can get in touch with a kennel in Thailand and ask them. They may know one or if you are interested in another Yorkie, buy from a breeder in Thailand.
I believe there is a breeder in Thailand listed on the website for ytca at
www.ytca.org and click on Breeder Contact.