1986 300d Auto (UK Car) Sudden no Crank

[Benstanley]

Hello everyone!

I purchased a 1986 300d from my father in law that had been stored in his garage for 22 years, I changed oil and filter, air filter, radiator, thermostat, fuel filter and all fuses and it was running (although a little lumpy). I booked it in with my local mechanic as the blowers weren't getting warm so I assumed my heater matrix was blocked. Last night I went to start her to get her ready for the journey to the mechanic and she would not crank.

I have looked through many old threads and have tried the following:

1. New battery
2. Check fuses
3. Check battery terminals
4. Used the middle plug on the firewall to positive battery terminal trick (it cranked but didn't start)
5. Tried to start in P & N
6. Wiggled the gear stick around the P & N areas still no start

My next job will be to try and jump the positive terminal plug screw to the purple wire screw in the engine bay and if it cranks I will check the harness above the accelerator peddle, is this harness behind the plastic trim to the side of the peddle as I have been having a hard time trying to find it.