Hi mate,
It's nice to kite in Denham. I used to go there last year, I had 25 up to 35 Knots every single day, during a week.
You should go to little lagon (the road on the right just before Denham).
It's fuc** flat even with 35 knots > good for a speed session.
Just one thing,there in a "ranger" in Denham, with a purple car, he's just decerebrated...

Cheers