With McLaren just down the road in woking you get so see some rather nice examples of these babies around here, and quite a few in london. I haven't seen a McLaren F1 yet though.
However, the biggest ferrari garage in the south used to be in the trading estate behind my work. Come spring you could see enzos, F-50, F-40, all sorts of 360 & 430 along with some of the front engine models doing the small test run between the garage and the petrol station besides my office. It's right by a national speed like and the engines got exercised properly.
It was a shame when the garage burnt down and they moved on somewhere else.