There aren't that many UK based airlines that can use the runway at SEN so it should just be a matter of elimination. We can exlclude Aurigny, Blue Islands and Loganair. BMI Regional might be a possibility as they would most probably like a near-London base. Could Thomas Cook base their A321 fleet at SEN? Don't think the runway is sufficient for their needs. Do we exclude the B737/757 operators due to runway restrictions? If we do, that then leaves BA (who have their hubs and most probably don't need another one) and....BA City Flyer!
I'm scratching my head about what has happened recently in the UK airline sector to make a possible deal fall over? Surely not Monarch?