Passat 2012 estate diesel TDI 2.0 Blue Motion - Intermittent Non Starts

[BusyBee]

Family Car Intermittent Non Starts (Re Occuring every month June, July, August..)
2012 Volkswagen Passat Estate TDI 2.0 Blue Motion.

Hello, I am new to the forum. I have been searching online regarding our car and very disappointed with not being able to fix intermittent non start issues. It works and then it doesn't and if I have the patience to wait 45min to 2 hours it will start again!

Any one having the same issue or am I the only one. I love it, but when I use it I am anxious it would not start when I parked somewhere away from home and then I would have to wait until it starts. No noise, no cranking, silence - but it starts again.

1) diagnostics conducted showed nothing wrong with the car (Arnold Clark £139Incl Vat)
2) Has new battery (replaced by mechanic - battery was not the issue) (Tried another Garage, mechanic thought it was the battery - £385)
3) ECU component sent for testing at ECUTesting.Com - Found no fault (mechanic adamant this was the issue £180 + £75)
4) Booked at another Arnold Clark garage who has a Master Tech, Local Arnold Clark has not got one but suggested to get a new used car)

Look forward to hearing from some of the forum members!