Just stripped it all out and it was as expected, the steel braided fuel line has rubbed an area about the size of a pea on the big live feed to the starter motor, the insulation has literally pin pricked through to the copper live wire and earthed itself where the fuel line touched on the inlet...scary but I can now put protective covers on the lives and replace all the fuel lines as I planned to one day anyway.....all in the name of development work eh?

In 4 yrs I have not quite done 1000 miles in the car yet!