I got back to this today - Got a couple of mates over to help too, as cranking it over by yourself whilst trying to see what is happening in the engine bay is somewhat difficult..
Started off refitting the rocker cover and oil cap - looks smart! I may do some more details later..
A new spade connector was attached to the mystical wire that seems to let it crank.
Applied some power via a handy Volvo, but no luck!
Spark was an issue - traced it to a king lead that had came out the coil when the inlet manifold was moved - once reconnected, We got spark!
We then discovered that the car would cough and attempt to start. The Inlet manifold was flooded with fuel from the cold start injector, so it looks like the 4 injectors at the cylinders are not getting a signal to fire.
The next step is working out what Relay controls that feed - I may need to pull in someone who speaks electric..