Apparently it was something going wrong in the control tower, however it was sorted out fairly quickly so any disruption was minimal.
Passengers down 1.7% in March at ~127,900 although so far this year passengers are up by 0.5% and rolling 12 months show an increase of 2.8% to ~1,764,100 passengers. SOU seems to be holding up fairly well considering the way the economy is and I expect to see more notable increases in the peak Summer period with the Olympics and new routes from Air France, Flybe, Thomas Cook and Vueling.
http://www.baa.com/static/BAA_Airpor...-March2012.pdf