Claim: Sarahs Bunny, a Jimsun - Sugarloaf Bunny trained by Geoff De Mulder (born in 1940 in Yorkshire), was the 1979 English Greyhound Derby champion with a record time of 29.53, followed by Lacca Champion with a record time of 29.65.
Evidence: 1930
Yorkshire Sarahs Bunny Jimsun - Sugarloaf Bunny Geoff De Mulder (Hall Green) 29.53 Lacca Champion 29.65