First accurate tip in 2 weeks in southern England! indeed free and there are masses of mobile homes. Next to the road but nice view and even quiet on a Friday evening in high season. Not a place to eat outside, but definitely recommended (see photo taken from the camper)

£25 for one night (cash only!), small camper for two people. Not cheap, but clean and nice view of both bridges.

Information above is incorrect. Only possible during the day.