|Knowsley Safari Park (aka Hendle Safari Park) 1973. Copyright John Dineley|
The sad and shameful truth is it was Holroyd himself used 'shake ups'. 'Shake-ups': a training method that no reputable marine animal trainer would have used then or now.
David Holroyd worked as a dolphin trainer from two years from early 1972 for ETAM (the leisure division of Truste House Forte) at Rhyl and Knowsley Dolphinariums. Truste House Forte at this time also own Belle Vue Zoo and later a further dolphinarium at Woburn Safari Park.
How do I know about this man and his time as a dolphin trainer? Simply because I was a contemporary of Holroyd and worked with some of his surviving dolphins (Duchess and Scouse) at Knowsley Dolphinarium.