You are right MantaRay, as soon as you insert your key it starts the warm up, I seen people in the know just replacing one plug ( False economy & time wasted? if you are going to change them, change the lot that will be end of, regards the Gardner engines, at that time they were the bee's knees of reliability, but at times they were a right Basd to start, we use Easy Start, we used Paraffin soaked rags fired up to start these engines but when stated it was as if a steel works had coaled up the boilers you could not see a thing. at that time the Sweds were coming in with the Vabis ( Scania) then the Volvo entered the UK, the best cabs for the driver came in the FORD, I think it was the T40 but that may be wrong, at the time Robinson of Carlisle was running their Fodens, later to become " Our Eddie Stobart, the glory boys". thats the time when you could tell the drivers from drivers, they had not got a clue to rope & chinese a trailer, but thats the way the job went.