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Fair enough, I assumed you were a Surrey veteran.
As you aren't, the main reason to go to Newlands Corner would be that as it has the large if rather slow serving cafe and picnic benches there it's a more natural furthest point of your ride. It also adds some climbing to your stats and has a nice view across the Surrey hills.
I'm struggling to get the file at the moment but if you have Garmin the route I would use is here.
https://connect.garmin.com/modern/course/859923
It's pretty much on the NDW, right next to the A25.
EDIT: sorted - https://ridewithgps.com/routes/33010861
Looks like a great route. You could prolly add Newlands Corner into that too. Approach it from the same direction but carry on the NDW for a coffee break there then head south and hook up with your existing route.
I headed out to Windsor on a road ride yesterday, not a particularly pretty route, quite traffic heavy and brutally fast given my ahem stomach issues of the previous few days as I hung onto the back of the road train for 100km.
EDIT: the pics make it look prettier than it actually was.