I completely agree, 200 car park spaces for (depending upon which part of the site you read) 3,000/5,000 spectators. Unless they are to park on the kart track or (looking at google maps) at the garden centre at the end of the road!
Also, the road looks extremely narrow and surely would have to be widened (perhaps someone who knows the area would be able to shed some light onto whether this is the case or not).
Call me cynical, but as hopeful as I am, things just don’t seem to add up.