There are two conflicting forces at play with regard to developing Goring Gap. The first, WORTHING LOCAL PLAN and the second, National Planning Policy Framework.

The first deals with the question of how do we recognise and preserve our green gaps? The second deals with the question of how do we build homes to deal with our expanding population and where? If we can stop breeding then we can stop building. 

The Americans have a wonderful expression – ‘not in my back yard’ or NIMBY

For the sake of clarity Goring Gap would not be a green gap had WW2 not happened. Secondly, the National Planning Policy Framework very clealy states:

The National Planning Policy Framework (NPPF) definition of previously developed land (PDL).

When drawing up or reviewing Green Belt boundaries, the need to promote sustainable patterns of development should be taken into account. Strategic policy-making authorities should consider the consequences for sustainable development of channelling development towards urban areas inside the Green Belt boundary, towards towns and villages inset within the Green Belt or towards locations beyond the outer Green Belt boundary. Where it has been concluded that it is necessary to release Green Belt land for development, plans should give first consideration to land which has been previously-developed and/or is well-served by public transport. They should also set out ways in which the impact of removing land from the Green Belt can be offset through compensatory improvements to the environmental quality and accessibility of remaining Green Belt land.

The definition of What is previously developed land (PDL)?

PDL: Land which is or was occupied by a permanent structure, including the curtilage of the developed land (although it should not be assumed that the whole of the curtilage should be developed) and any associated fixed surface infrastructure. 

If have you have failed to miss the building, there is a building already built on Goring Gap, a permanent structure with telephone cables running to it. Underneath it (everywhere) is a large main drains infrastructure. It is the pumping station, which was part of the original planned development in 1936. Goring Gap has been developed already and is therefore not virgin green belt.