Off-road routes around london?

Nice ride that. A few mates and i took that route to Oxford. Ended up doing 89 of the 99 miles as diverted to road in the more meandering sections.
Bloody lovely on a summers day. Just don't have too many beers at Windsor, makes the rest of the ride slightly more difficult. Especially when doing it fixed!

i've ridden out to windsor along the thames path, was fine on a road bike with 32c tires and a fixed bike fully loaded with 28c tires, noce ride for the most part as well.