We have received the following information from Dartford:
Prices are £10 Adults, £5 concessions and £2 children. There is no extra charge for seating although it is on a first come first basis.
We have a car park for 300 cars so should be ample but would recommend getting early. Dartford Station is about a mile away and is about a 20 minute walk. Alternatively there a Fastrack bus service from Dartford Station with a bus stop at Princes Park.