Suddenly my father leapt from the driver’s seat and climbed into the back next to me, leaving the car to hurtle towards the steep sides of the mountain tunnel. With great effort I leant over, managed to grasp the wheel, and steered us back onto the road.

The crisis over, I told my mother that I now had sufficient evidence to demand that my father’s GP revoke his driving licence. ‘Good luck with that’ she replied, ‘But you do realise that this is just a dream?’