The following people have helped me with this project over the years in one way or another. My grateful thanks to them all: Bob Ashcroft, Paul Baillie, Peter Brawn, Martin Daniels, Dave Goble, Roy Litchfield, Nigel Lutt, Alan Mollison, Rosemary New, Keith Roberts, Mike Sargent, Mark Scoble, Alan Shayler, Barry Taylor, Dave Taylor, Kent and Siobhan Young. If I've not mentioned you, do make contact again - I lost a lot of contact details in a computer crash a few years ago.