It all comes down to profitability, and not lack of will.
SEN-DUB was a loss maker.
SEN-MST and ANR were loss makers
RNS and GRQ do OK, they are pretty solid as recent loads seems to indicate.
I personally don't see what the issue is with Stobart. Yes they tried a large operation and it didn't work, so the cut back to one that does. Is that not good business practice?
VLM at SEN? Never work, they're too expensive and the F50 is even slower than the ATR! Plus they have very limited brand awareness now in the area and would be competing against the big boys with a very expensive product.
SEN is a cheap as chips market, it may develop a business market in the future but at the moment, that is sown up by LCY and to an extent, STN.