Thanks for the help, guys.
X-1 Grand Slamm, I'm thinking, and the front end is definitely Krell.
I found out a bit more about the owner (or non-owner, as it turns out). The local high-end audio dealer has the system set up at the house to demo it to potential customers. The home owner sort of rents the system for about £100 a month!
The thing I find a bit tragic is that room is an acoustical nightmare, by the look of it. I'm dying to have a listen but I'm pretty sure it'll sound terrible, with all those reflective surfaces. Which goes to show that a lot of millionaires buy systems on the price alone. It's just another toy to these people.
Then again, maybe there's a wonderful room correction system there. I can't see one, though.
Also, back in the days when I wasn't broke, I had Audio Research/Krell amplification and I never much liked it. Then it got stolen, but that's a whole other story...