Where To Go?

[philly]

I have a few days off over the next couple of weeks and I fancy a bit of a road trip with a couple of mates to try a few off road tracks. Where can you guys suggest that we could try for a day or half day's racing/playing mid-week, without getting arrested for trespass! Distance not too much of an issue but as we're based in Yorkshire, keeping things north of Watford would be nice.

Thanks.