Originally Posted by
Evanelpus
Don't forget that's where Top Gear is filmed, the smoke could have something to do with that.
As for the biz jet, yes they still land at Dunsfold (you've only got to watch the Star in the Reasonably Priced Car) to see they do visit.
If they still film Top Gear there (Evans seems to be filming anywhere but at the moment) it would only be mon - wed, not weekends.