Problem with Stands 6-14 is that anything with a tailfin above about 9.5 metres causes the "transitional surface", i.e. a 1:5 slope extending out from a point 150 metres from the runway centre line. This is one of the complex obstacle limitation surfaces that are designed to protect the runway. However I understand that SOU may have been given some form of waiver from this by CAA.
Second problem is at least Stands 6-12 were constructed to take a lower weight of aircraft than Stands 1-5. Suspect that this also applicable to Stands 13-14.
Maybe someone out there who is still gainfully employed at SOU can elaborate.