PhilM - Do you recommend EFI101 because you know their courses are good, or were you just using the name as an example? I want to taught all about it, not find out by blowing things up etc, there's not a great deal of science in that unless you have a base to start from. So Jano's theory is all well and good, provided you have some ground to start from. Thanks for the thought, useful reply

Icurus - Once I know how to map, that will be a good way to advertise what I can do, but I need to get there first!