Unfortunately, his passport had just expired, so he didn't make it through US Border Patrol at the airport.
We didn't even think of checking it, as we were just in Florida a couple of weeks ago, and crossed the border twice without incident.
He came back to London, drove straight to the Passport Office, and had it renewed today. In fact, he's picking it up as I type this.
But, he's going to have to settle for a Conference Call tomorrow.
Live and learn!