Interesting synopsis. But, no, they are not French although one of them has a fairly extensive exposure to French culture. And they do spend some time in France regularly.
I expected more of the Petrus '70. Nothing wrong, just maybe a slight bit over the hill, rather muted aromas, flavors didn't have much zest. It was decanted 1 - 2 hours before serving so I wish we could have had it without the time lag. Perhaps I'm being too critical here as it was a real treat to be served this classic Claret with generous pours (which I drank almost all of). The pairing with the leg of lamb was inspired.
. . . . . Pete