I've had cause to disagree with some of FRatSTN's comments about SEN in the past, but I must say that I broadly agree with his analysis of the EZY situation at SEN and STN. Bucket and spade routes will be the main successes from SEN, and I think these routes will be able to sustain EZY's operations from the airport. They could also try more routes to eastern Europe and Scandinavia but, again, these will mainly be leisure routes.
I also think the route to EDI would work better if the trains were available. Apparently SEN will struggle to get Network Rail to agree to allow trains to operate earlier and later because they say they need the night hours for maintenance of the track. Seems daft to me, but apparently that's the reason. So why don't SEN run an effective coach service to Stratford and Liverpool Street early and late in the day?