Philip was instrumental in helping to establish the sport and took part well into his 80s but gave up competitions some years ago.
He said: “I started driving because I’d been playing polo, and I decided I’d give up polo when I was 50.
“I was looking round to see what next, I didn’t know what there was available. And I suddenly thought, well, we’ve got horses and carriages so why don’t I have a go.
“So I borrowed four horses from the stables in London, took them to Norfolk and practised and thought – why not?”