Yes it is a terrific book. He challenged many conventions as to what works and doesn't work, in terms of methods, timings etc.. I have never found a book anywhere like as good.
The course was a two day affair, a birthday pressie, with overnight accommodation in a great B&B farmhouse, and he took us into a garden to strike cuttings, take seeds etc., many of unusual varieties, and we took our efforts home. He really was inspirational.
