Pottwiddler- cant see how SOU could really encroach on the BOH leisure market . SOU has the catchment area but the shorter runway thus restricting aircraft types and BOH has the longer runway but is "off centre" of the main catchment area and is less easy to get to. Some years ago Palmair did summer charters from both SOU and BOH using the 146 but it was short lived and they dropped SOU after , I think, one season.
It also looks like Thomsons are no longer flying their sole weekly charter to Palma from SOU next year and will concentrate on BOH.
Never understood why BAA did not make an approach to buy BOH!