I'd picked him and the Tiniest T up from school which is an uncommon enough occurrence for me to have got us lost on the way back to the tube.
"What would we do without google maps?" I remark as I steer us back in the right direction.
"Well," says Trefusis Minor, who thinks rhetorical questions are pointless, "We would look at the sun, or the North Star or the moon if it's night."
"But what if the weather was bad, like today?" I say.
"If it's cloudy we find a cathedral and wherever its front entrance is, that is east."
"We're a bit short of ready cathedrals in Parson's Green, I think."
Trefusis Minor - ever resourceful - says, "Actually, we could find a spider web - whichever side of the web the spider is on, that is east. If you are superstitious." He adds.
I'm seeing Dr Luca Russo to show him the new creative I've come up with for his advertising in Harper's Bazaar - he's a cosmetic dermatologist of some repute, with a rather glittery client list - top secret of course - of the rich, famous and exquisitely beautiful. So beautiful are some of his clients, I wonder what work they might possibly have had. This is his hallmark, I deduce: if you're one of Dr Russo's clients you can pretend you've had nothing done, you simply look as if you've been at livery for a few months, all fresh and glossy and polished.
Anyway, we talk about business for a bit and in the course of conversation I'm suddenly very curious,
"So, " I ask him, " what could you do for me, if I were one of your patients?'
He looks at me consideringly and says, "I could not make you look ten years younger."
"Really?" I say disappointed, "But I thought that was why people came to see you, to look younger. I feel about a hundred and four."
"Well, maybe I make you look one hundred. But no, is ridiculous to try to be younger, what you want is to look marvellous."
"Oh yes," I say, rather cheered by the thought of looking marvellous, and also thinking he's quite right, people who try to look young again always look a bit wrong, "I think I'd like that."
"You see," he says, "One look old because one look exhausted, stressed, worried. I get rid of all of that. You will look bright, fresh, as if you have never been tired."
I like the sound of this enormously, no scary Nicole 'surprised' Kidman eyebrows, but with a little light Botox, mesotherapy - which involves lots of tiny yet painless micro injections of a cocktail of vitamins, minerals, amino acids, hyaluronic acid into the face - and some light fraxel to remove sun damage, I can have a face that no longer looks knackered and careworn.
He tells me in absolute cross my heart scouts honour secrecy about one of his patients, an extremely
well known British actress, not young but wonderful looking.
"Really, "I say, astonished, "You do her? But she doesn't look like she's had any work, she looks marvellous."
Dr Russo smirks, evidently pleased with his own handiwork.
"That's what I told you: marvellous"
"Where do I sign, I say."
Dr Luca Russo, The Rejuvenation Clinic, Harley Street, W1.