I saw this monster in a private area within the flagship West London Audi showroom some time ago - but it was a private viewing and 'not for the public'. The chances of actually seeing one of these mythical beasts is actually pretty slim really!
However - Bang & Olufsen of Canary Wharf have one in their showroom at present if anyone wishes to amble down and be amazed by this gargantuan piece of kit.. You'll be blown away - it's colossal.
Here's a link to their website for the address.
It's only there until the 11th May by the way - so you've only got a few days, then it moves on.
Lee
BeoWorld - Everything Bang & Olufsen