No so much wild but it's free and not in a specified site. Parking on the beach and a water tap on the ferry jetty. Ferry Road, Portsmouth. https://maps.google.co.uk/maps?q=Ferry+road,+Portsmouth&hl=en&ll=50.794217,-1.030719&spn=0.003554,0.009291&sll=52.8382,-2.327815&sspn=3.755796,19.02832&t=h&hnear=Ferry+Rd,+Portsmouth,+United+Kingdom&z=17
bleedin " great innit!!! me , lover off all things Portsmouth , stuck in Glasgow ! how envious am i !!!(lots) and yes i did live there , was wonderful !(94 _96 ish)
http://www.wildcamping.co.uk/forums/hampshire/9366-portsmouth-beach.html See last couple of posts ..ughh