Thieves jamming car-locks?

Surrey police are exploring the theory that a gang of car thieves are jamming central locking systems to make it easier to steal goods from cars.

The theory arose after one a witness reported that a man used an electronic device to prevent doors from locking when he parked his Lexus at a local Sainsbury's.

via www.theregister.co.uk

That's a little worrying. I was in the Waitrose (how middle-aged am I?) car park on the way home from work a couple of weeks ago, and my car resolutely wouldn't open.

A couple drove up and told me that this was a common problem, and that I should go and see the manager about it. I said that it wasn't a problem, I could manually open the car, and they drove off. Just before I pulled off the manual open cover, I tried the fob lock once more, and it worked. Now I'm suspicious of that couple's motivations…