Lovely day, and we're off to Piccadilly for the Regent Street motor show. We're there for the vintage cars from tomorrow's London to Brighton Veteran Car Run. They're marvellous. All at least 110 years old and many boasting only one cylinder. Ten horsepower is unusually powerful. Loving restorations and, in many cases, owners in period dress. There are also sections of the show reserved for the ultra-new. Hydrogen and electric cars on display. We're taken with a Tesla with the smallest of batteries in the cavity under the hood and extra space for tiny rear-facing passengers in the rear of the car.