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Thanks guys for your input, the problem is solved. Woohoo!
I had gone through all the difficult stuff only to find that it was simply a poor connection at the Positive terminal on the battery, one of the electrical sockets that feed out of the battery had a bad circuit. (Open Circuit in fact) After I went to the auto electrician and told him I had a bad connection at the battery that I had to sometimes tap to get ignition he started there and found the fault.
One of those DOH! moments.
All working now and I'm doing a wire clean up over the next few days to make sure everything else is in good condition.