Jet2 may not be a bad shout, at least mid-term. They did start out at BOH in the Channel Express days. Also their next phase of expansion once BHX/STN are sorted is further south, and their product/clientele would be well matched
I'd imagine BOH would be one consideration, though it would have made more sense while MAG still owned the airport, so that LS fly from all 4 of their airports. I'd still be a bit sceptical though, considering the CEO ruled out a return to BLK, a simliar size/style airport to BOH, and now that Rigby have vested interests in both.