“In 100 meters, I’m going to talk to you in that special voice, which should let you know you’ve upset me in some way that is bound to be your fault,” so says the Sat Nag which shows you’ll never need to be without your partner again as you struggle to find your way on the road.

Yes, your car journey will never be devoid of the wonderful feelings of anger, frustration and near-on divorce. Just pop the Sat Nag on your dash and your marriage will feel right on track even if your way through the traffic isn’t. Absolutely no GPS use whatsoever but an incredibly patronising female voice…