That's a great site for EasyJet to have advertising.
The large rolling advertising screen at the Woolston side of the Itchen Bridge used to have a large Vueling advertisement when they operated from SOU perhaps EasyJet could advertise there as well as it's located in a prime position.
I hope the word gets about regarding EasyJet at SOU which if so can only help regarding any possible expansion from the airline in the near future.