Newer Diesels...

[Niall]

Tom i do understand your situation and the issue with having to trust the car. I was in a similar (albeit not as severe) situation when my car shat its big end. I also understand that due to your OCD etc, its even worse but unfortunately your going to have to come to terms with the fact that a car can not be relied on. If its done 1 mile or 1 million miles, if it cost 5k or 500k new, its still not going to be 100% reliable. Like i say, anything that is mechanical WILL wear out. Thats just a characteristic of all things mechanical no matter how well made they are

Sorry to say it mate but the sooner you come to terms with this, the better it will be for you. I know its not easy to just do like that but you will have to.
Also like i said, regular preventive maintenance will help prevent breakdowns (not not eliminate as obviously you can't check everything!)