Although originally written for problem solving in the Land Rover screened ignition system, there is a lot of information common to non-screened systems in other types of vehicles.   There are now sections listing a large number of Lucas coils & how they are coded & how they are expected to perform. Also a section on the effects of heat on coil breakdown, information that I discovered myself that can't be found on the internet.   For those who have waded through this before the main