Green lane/patch Tolworth, Surbiton area?

[fozzy2926]

Rather than making a mess of my XChallenge learning to ride off-road (the 1150GSA doesn't even come into the picture!), I'm seriously considering buying a Honda CRF250X (lighter, less power etc). While in London I've booked a test ride for tomorrow with Tippets at Tolworth. I will be grateful if someone knowledgeable of the area can point me in the direction of a small grassy patch or lane where I can at least stand up to pootle around and be a little less likely to scratch the bike if I drop it. I certainly don't need any jumps, ruts etc.!
Thanks,
Steve
Oh, and if anyone has a little used CRF250X that they wish to sell, please let me know