Guess I must have been unlucky then - took my an hour and half to get off the m4 and into the parking area (I also paid for the designated parking) and it took me an hour to get out again afterwards. But other than that, it was one of the best half marathons i've done. Really well supported all the way round, and the stadium finish is cracking.
Silverstone is a bit drab, and always windy, but there is something about it that has made me go back again......
Is it too late to change my mind
But as Stevie says, both are top notch and you won't be disappointed with either
Reading is a more interesting route, but a complete ballache to get to/park etc. Silverstone is dead easy by comparison, but the novelty of running around a grand prix circuit soon wears thin. Both are really good events, and you won't be disappointed with either. I went through exactly the same thought process a couple of weeks ago, but in the end plumped for Silverstone purely on the ease of getting to and from the place. Hope that helps!