Thanks very much for your responses and suggestions, Jane and Pat.
In the meantime, I have also heard from other breeders that Michael Smith (Helleborus) sadly passed away last year. The Helleborus cockers were a really fantastic line, not only wonderful looking, but exemplary temperament, very sweet, smart and sensitive.
Here are some of the ancestors that I am looking for: Sweatmans Sunny Sunshine (mother), Burnchild Simply the Best and Kentee Sweet Surprise ( G parents) and Sandvika Out of the Blue, Burnchild Gemma's Tristar and Pippins Princess ( G G parents), Craighleigh The Great Waltze, Hightress Sweet Talk of Lochranza, Danesmead Razzle Dazzle of Burnchild, Merrytree Chewbacca and Colemans Black Gem ( GGG parents). Hopefully I can make some connections here