I quite agree but probably should have said that both times I've seen them pull out of private driveways. Maybe it's a perk of being a Pagani salesman - if I can't get a test drive maybe I should think about a career change.
If you are in London you have just got to get to Romans on the A217. They currently have in stock - on display a Ferrari Enzo, F40, Zonda, DB9, Hummer, 911 Turbo Convertible, Challenge Stratdale, etc - better than the motorshow!