Someone tells me that Reading was on here briefly, but soon taken off!
I think Reading is ok if you get to start from the front pen. My pal has done this and he's a similar pace to me, circa sub 1hr 20, and he reckons you start in the elite group at the front.
Now that would be fun, bearing in mind the winners do just over an hour 
Not sure i'll bother doing it if i can't by hook or by crook get to start in the right pen. Otherwise you'd be fighting your way through! I used to do that at Silverstone, as when I got myself to the front I couldn't get near the right area and had to start at the 1hr 45 bit!