Many many moons ago, Plant Heritage held a plant health workshop at RHS Wisley. One of the speakers at the workshop was Neil Helyer of Fargro, and after the workshop he treated the participants to some of his home movies about biological pest control.
Another new publication is The Fundamentals of Horticulture – Theory and Practice, edited by our very own Chris Bird, stalwart of the Hampshire PH Group, ex-Collection Holder and lecturer at Sparsholt College. If you peruse the contents you will notice that there are chapters from Mike Buffin and Tim Upson (Chair of Plant Heritage and Chair of the Plant Conservation Committee) and Rosie Yeomans, (Collections Coordinator for Hampshire) as well as Neil. Also from Amazon.