Devonair - agreed I was probably stretching the point including Exeter in the catchment area as the transport links are awful to the west of Bournemouth, far better links exist to the north and east. You are correct in pointing out that BRS is a better option for most of Devon.
However the fact that BRS takes almost as long to get to as LGW from the Dorset & West Hants conurbations is my point in arguing that there is untapped demand from BOH that Ryanair will hopefully take advantage of.