NAC - London Auto Enthuiast Sites to see?

[RyanWeath at aol.com]

Officialy NAC. . .

Will be in London in March for a bit under a week.  I've had the McClaren 
dealer, the local Audi dealers, and a few museums, etc, recommended to me.  
Anything else especially cool that I should check out that is within public 
transporation distance (I will be car less).  (Any factory tours that are 
close???) Also might make a day trip to Holland - anything worth checking out 
there auto wise?

-Ryan Weatherby
Chicago, IL