Urgh I know what you mean, I love to see luxury fast cars on the road, but rarely do. Last saturday I saw an Aston Martin DBS, I LOVE aston martins and this was the first time I'd seen a DBS on the road. Better yet it was parked up, so I walked past it and got all excited....hope the owner wasn't looking!
I have never seen a Bugatti on the road, seen one in a show room and jeeezzzz thats one hot car!
I live in harrogate which is kind of an affluent area so your more than likely going to see a few nice cars, especially on a saturday, I mean I've seen several Lamborghini's including Murchaligo casually parked up, Ferrari's, I spotted Mercedes F1 Maclaren driving past, Maserati, Bentley and obviously Aston Martin.
Haven't seen a Bugatti in Harrogate but I think its only a matter of time, as there is dealerships nearby that sell Bugatti Veyrons, possibly at JTC600 Leeds or most defiantly at this place on Canal Road in Bradford.