Southampton are GA friendly, they often do not have anywhere to park GA. Due to a severe lack of apron parking space, Southampton has been PPR to GA for the past few years. If you do want to fly in there you need a PPR number from Airfield OPS (02380 627102) or go for the executive service and park on the Signature Flight Support Apron.
If you get the PPR number its a landing fee and free transport to the Terminal.
If you go the executive route its a landing fee and loadsa money for a handling charge, although you should get free tea/coffee and biscuits. Signature can be contacted on 02380 627039.
Signature have more spare space, but at a price.
If you are thinking about trying to get into Southampton between 15 -23 September, get your bid in now. Its the annual Southampton Boat Show when every spare inch of parking space is taken up with visiting aircraft. Signature have even been seen to turn prospective customers away during Boat Show week.