I love the bit where Philippa anxiously asks him if it's quite safe to drive the cart and he says oh,yes, sure. Somehow that sounds like a typical interaction between them (as it would be for me and my husband).
Just a few observations. . .
Well, if driving his car full throttle has been taken off the agenda, seems like he's looking for other little thrills. But with 130 acres, I imagine he CAN actually drive on his own property.
You know, he stresses often how he is not competitive, but I actually think he is in his own way.
Interesting how he identifies with his Clydesdales "They're big and I'm big." "My boys" . . .
He refers to his age a lot.
Finally, IMO there's something wrong with the picture of him driving a metal cart around Dorset with that Aussie cowboy hat. Kind of like (for USers) when Michael Dukakis posed for that missile photo. Can't quite identify what the internal disconsonance is.