I’d be surprised if it were statutory land, presumable Binnacle Way North Harbour PO6 4SR, to the west of what used to be IBM North Harbour, north of the M27 and south of the A27. Nowhere near Portsmouth Harbour (about 5 miles away). I’d want to see the byelaws to be sure. Reclaimed land built on in the 1970s I think; I started working for IBM in North Harbour in 1984.