The GS\483 is the Redmon GP and as Marco said is a brilliant event. In the past it has been won by vets such as Sean Yates (being towed round by one B Wiggins if I remember correctly).
The course is slightly different from the one Marco has ridden.
It starts at the same start as we use for the Club 10 and then up the A24 to the first roundabout.
You then take the Rusper Road exit, which many people will be familiar with from their first time riding and going off course on the Club TT (Sean?). You follow this road which eventually comes out in Rusper (if you're riding the club run it is the right turn just before you get to Rusper). This is probably the lumpiest section of the course with a couple of nasty kicks but nothing that is really hill like.
You then turn left and reverse the club run route to Newdigate. In Newdigate you turn left (make sure you don't take the first left
) and follow this road back towards North Holmwood.
There is then a left turn which brings you along the road which runs along the top of the hill towards Inholm Lane car park (again familiar from the Club 10s) where you finish just before the car park.
The lanes are lumpy but it's not a hilly course.