My father once gave my mother a driving lesson on the beach carpark while the three of us were in the back of the car. She remembers us shouting, 'No Daddy, please don't let Mammy drive.' She never learned. 45 years later my niece sends me a photo of her on a mobility scooter for the first time, negotiating Debenhams and M&S, her handbag in the front basket, her walking stick slotted behind the seat. 'Go, Mam,' I am shouting from 1,000 miles away.