Was it really seven years ago? Lord Browne thinks that was when we last met formally - we've seen each other since at the occasional party or dinner - but that would seem about right: 2006.
Then he was CEO of BP. The following year, in May, he was gone; forced to resign after his attempts to prevent his gay relationship becoming public were revealed.
Back then, his office was a grand affair. There was a feeling when visiting him that the entire BP headquarters, indeed the whole company, had been crafted in his own image, from the frock-coated security guards to the vast, art-adorned lair that was his.