Have any of the interested parties started the process for the registration of Old Sarum Airfield on the register of local amenities? While the RLA Is not an automatic protection, it is a means of putting down a marker to the fact that local people are concerned about the future of the amenity.
What is more important is that this airfield has not been cultivated or sprayed with noxious chemicals since 1918. It is a haven for rare species of flora and fauna and a valuable lung between Salisbury and Amesbury.
The ancient monument of Old Sarum benefits from being surrounded to the north by open fields and the impact of more housing would detract from the panorama for visitors to this unique historic place. I would have thought that Natural England and The Environment Agency would both have had a strong voice about further development on the airfield site.
There may well be other agencies and interested parties who would be concerned with any further reduction in the amount of open space afforded by the airfield and the farm land to the south. Such as https://www.english-heritage.org.uk/
And International Council on Monuments and Sites.
All of this should be made clear to The owners of Old Sarum Airfield Ltd so that they may save themselves any further expenditure in the pursuit of fruitless applications for development. Hopefully they will see sense and they will pack up their bags and go after other opportunities with less problems in their quest for profit.