Perhaps we are looking at a 146 with lower airframe hours, how about a Atlantic from Vagar or Transwede with BAE RJ's ?
Remember that the Saab 2000 and ATR42 seats 50 max, the ATP seats 64 and the ATR seats 72, then there is the dash 8-400. So only one British airline currently flies a turboprops with over 64 seats !
The 146 has proved to be so flexible, they will have to look carefully at it's replacement, the only thing to replace a 146 is a 146 on this kind of route
( and where have we heard that before ). We can soon cut the operating overheads, base just two aircraft at Aberdeen for the contract and then suffer the catch-up delays when the weather has stopped flying and then clears.