Thank you, @axelb. Nice to be mentioned in the same way as the big hitters in the world of self protection.
Many thanks to everyone for all the info. I’m curious to know which of those mentioned have significant first-hand experience from real life. I know Lee Morrison, Peter Consterdine and Geoff Thompson all do. There must be others. Who’ve I missed out? I think first-hand experience matters, because there’s a world of difference in teaching what you would do vs. what you have done.