Rob McMahon, of Totally Taxis, writes:

Regarding the damage suffered to Val and Sylvia Harder's car in Morrisons' car park. I have installed my own CCTV in my car, it cost under £50. It has a close proximity sensor which switches the camera on if anything gets too close. I  also get a discount on my insurance for having this equipment which more than pays for it. Very useful in the lanes were blame is difficult to apportion.

Maybe Morrisons could offer this equipment for sale at a discounted price.