Frank buck never kept many terriers, but in the 70, and his were all black, but his grandson did have a crossbred terrier.
Buck was a straight forward guy he would tell you to your face what his thoughts were, we never had any terriers from him but he offered the ocasional encoraging word.
I will always remember him comming up trumps with a fox on a fellside when i thought his terrier was rabitting, credit to him.
A good guy and a good yorkshireman