Thanks TCAS FAN that was articulately put.
This development at SOU plays into Ryanairs hands in a big way for their BOH hub. In order to extract maximum pressure on BOH to reduce charges they will no doubt start talks with SOU. Interesting times. Look at what they are dong with Laudamotion - pitching Airbus against Boeing to get a better 'BOEING' deal. Look at what they are doing with Southend - pitching Stansted against Southend to get a better 'STANSTED' deal.
If Ryanair started a few services at SOU it would be VERY interesting indeed. It may even prevent easyJet and Jet2 considering SOU due to space constraints.
BUT BUT BUT does SOU have the ability to actually provide a deal low enough for FR? Perhaps not.
If easyJet go into LHR when the 3rd runway is operational, Ryanair will absolutely go into SOU.