The Gosport Rapid Transit scheme shut down a year or two ago. The aim was to build a tunnel under the harbour mouth to llink Portsmouth Gosport and Fareham. I imagine they spent a lot of money proving it wasn't financially viable. Marseille has a very viable road tunnel under the harbour mouth but that's the Vieux Port, which doesn't take anything as big as what goes into Portsmouth.
Sadly people don't appreciate the open space and wildlife habitat that an airfield provides. I flew into Portsmouth on the last day and you'd be hard pressed to find any open bit of grass bigger than a back garden on the entire site now.
Hamble, Lee on Solent, Gosport, Thorney Island, Tangmere, Ford
