I'm also going.. getting the train to Dorking and watching here... http://www.surreyhillsroadracefestival.com/ It's close to the box hill loop so depending on how many people are there we might walk round and watch on the free part of the box hill loop.
off to watch r/r on saturday anyone got inside knowlege on good veiwing point road closures timings ? basically any info is better than the limited amount on official web site.