Royal Quiz

Well I'm 95% sure that the "who" is HRH Edward, Earl of Wessex. I'd guess the "where" is next to the Royal Yacht Britannia (but where it's moored is anyone's guess). The "what" is of course a facelift XJS so that's leads us to the "when" which I'd expect is the early '90s. As for the "How", a number of Royals used to drive an XJS it seems, including Princess Diana.

And if you've ever wanted to see Princess Diana with an XJS, you're in luck: Princess Diana and Jaguar XJS - Royal wheels

According to this website, it was 1992 and Aberdeen:
Prince Edward - Royal stars & their cars

Well I was almost entirely correct

Yep, well done Galcian. That V12 6.0L is certainly a good looking car !