Hi Ian,
Before I can carry anything belonging to the Health Board in my car I am required to supply a copy of my insurance and have it cover business use.
Then I need permission from my line-manager, which doesn't happen, so I need to book a pool car, which needs my line-managers permission and so I get quizzed about why I'm going out, at which point I have lost the will to live.
When I worked for one of the dialysis manufacturers they insisted that any delicate equipment, such as reference instrument of DVM, couldn't be left in the company supplied car overnight as any temperature drop might affect the calibration.
The sooner we all have systems like Chris at Lister then the better we can analyse any breakdown cause and go out properly prepared to provide a first time fix.
Until then it will always be the case that the £25K of spares in your car don't include the 35p O ring that you need. From bitter and twisted experience
Gerry