Don't know if they've changed their charging policy for this year but I was definitely quoted around £75 per person 'landing fee' two years ago. They wouldn't give you a PPR booking until you'd paid either and no refunds!
That was the year it rained for a week beforehand and the vehicular traffic came to a grinding halt. It was also very foggy until lunchtime and I don't suppose many aircraft could have landed. I drove, sat for 4 hours in the car in stationary traffic then walked for 6 miles, getting in just before the start.