Can you get someone to turn the key while you hold each lead close to the engine in turn? I know you said you couldn't see a spark inside the lead, but you really need the end of the lead to be close to an earthing point to see it arc.
Also, was it wet/humid when the car was last running? Did you go through any puddles? Pull off the dizzy cap and give it a spray with some WD40/wipe clean with a dry cloth to ensure there's no moisture trapped in there. It could just be some condensation trapped in there. Another member had a similar problem a few weeks ago I think...
_________________ '77 Leyland Mini Van
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