Trislander, on the subject of being pedantic, not all Stands at SOU can accomodate B757s, which actually take up 1.5 Stands when parked.
Firstly only that part of the apron between the mini Stand 1 (after BAA built a giant portakabin next to the original Stand) and Stand 5 can take the weight.
Secondly, due to the tail fin height of a B757 (and B737/A320) they cannot park on Stand 5.
Stands 6-12 cannot be used. Due to the proximity of these Stands to the runway, a current height restriction of around 9.5 metres applies to Stands 6-12, fine for a 146, but not a lot else. Above this height an aircraft is an obstacle to the runway and could affect the runway operation.
The Stand 6-12 height issue could have been resolved during the planning of the new multi-storey car park, insetting its eastern edge to allow for enlargement of the Stands. However the airport's senior management at the time decreed that it should go in its current position, against the advice of their qualified subordinate staff. Furhtermore when the car park was completed it posed a security threat, overlooking Stands 6-12. This resulted in further considerable expense, to BAA, to install a high security fence around the upper level.
If I were a BAA shareholder I'd want those responsible bringing to book, but unfortunately as with many large companies when you reach a certain level of management, such cock-ups are glossed over.
Bottom line is, where are the ERJ 195s going to park when Stands 2,3,4 are taken up with B737s/A320s and the odd B757? With the tail fin height of 10.52 metres, can the 195 be squeezed onto Stands 6-12, or will the car park win!