Ah yes the good old Haddenham Buisness Park. I've been there many times, mainly because it's the only big expanse of tarmac that you can find around this area (not including Thame of course)
I usually try up or around the Whiteleaf Cross area, there is some good woodland up there and it tends to be free from walkers and Horses. The problem with Nitro's is of course they are so bloody noisy. That's why I have moved over to electric. However, you don't get the thrill of the smoke and (contradiction alert) noise