I heard Abbey Wood and Thamesmead are OK, loads of caravans around that area. This must be an inner London holiday campsite area? Best thing is to take Dico's advice and drive at least 20 mile from Erith. If you are bored go to the boozer opposite the centre (If it is still open) you will be able to put your boxing skills to test. And after a night out, always go to the burger bar next to the centre, that will keep you on your feet all day lol.