“I am actually an excellent tour guide,” he said, which made me laugh more. “Are you indeed?” “Yes. I’ll prove it to you.” “Oh my God,” I said, suddenly excited, “can we be tourists for a day? And wear those awful ‘I heart London’ T-shirts?” “Yes,” said Theo, but I wasn’t finished . . . “And have afternoon tea? And fish and chips? And take photos where it looks like we’re holding famous landmarks?”

