OK. Here are the pictures of my present crank sensor cable route as promised. I will, though, be modifying this to include the cable tray as Marks DTM suggests. Hope they are useful..............
1. Here are the connectors at the top of the plenum for the sensor. The green arrow is the new connector, the black is the old which I have left in place
2. I cable tied the cable to the vac pipe
3. Using another cable tie, I then attached the cable to this pipe
4. The cable then runs past an A/C pipe
5. And then past this pipe
6. The cable then goes into the darkness of the engine bay and leads to the crank sensor
7. This is a view from the top, showing the exhaust manifold, down pipe and sensor cable
I hope that the pictures are fairly easy to follow / work out. It is quite hard to focus the camera on just the cable / connections!