
There is no such thing as a 'Toy Yorkshire terrier', there is just the one breed. due to the fact that there are many bred from poor quality parents, by people who have never even seen the breed standard, so called Yorkshire terriers can be any size from the correct to Cairn or Westie size, and vary from the correct Blue and Tan colouring to Black and Tan and Silver Grey and Tan.
If you are looking for yorkies conforming to the Breed Stndard I suggest you contact a local club dedicated to the breed, the Kennel Club can supply you with contact details. you can then get in touch with a club member, this doesn't guarantee that they are Angels, but they are more likely to be reputable!