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Yeah, it's a really nice, quiet route. It's also good as it runs near/past quite a few stations should you want to bail early. It's rolling with a few hills but I've taken a group of 15 friends who only really commute/leisure cycle and they all made it.
Obviously don't follow it tom my mates house in Brighton, just go straight down Ditchling Road to the beach. There is also a 'velodrome' in Preston Park (Square and not very banked).
Is that a reasonably quiet route? It goes through East Grinstead and my family live not to far from there.