Mr Brookes-Ward said: “Today, being Sunday, you ma’am would have competed in the private driving.
“You would have gone for a beautiful drive. But actually, you would have been led in by the reigning young driver national champion, Lady Louise.”
The Countess said: “Absolutely, I trail in her wake frankly.
“No, she is naturally so good at it, she really is. It’s something that she has taken to very well.”