Quote Originally Posted by ReefMagnet View Post
Righto, I'll have a crack of figuring this out. Believe it or not, the ECU gets it's earth from the top of the engine, around the throttle body. There's two earth wires/connections adjacent to each other connected to 6mm bolts (from memory). If these connections become poor - and heat can turn them from just passable to problems - the lights and starter will work fine, but the car will absolutely not start. Check these connections and clean them up. May or may not be the problem, but it was on my old girl 10 years or so ago and after fixing this she didn't miss a beat and is still happily running today.

Cheers reef, he gave that a go. They were a pretty poor connection but didn’t seem to solve it unfortunately