Hmmm, I guess I could test this wire and the black wire, but I lifted out the dash and can see nothing wrong in there, and nothing else wrong with the wiring in the engine bay, surely I'd notice if there was a problem with any of the wiring? And if nothings wrong it will have to be a sensor or something like that?

Yea its the coil then, I got into a habit of calling it a coil pack wich I guess I shouldn't have lol

Swapping a few sensors with a friends sierra to see if I can get it going, will let you know how I get on.

I guess there's a few relays that could possibly blow as well that would be worth checking?