The whole storyline about him having to choose "one person" doesn't make any sense though.
Losing Kelby, or Margo isn't going to save as much money as losing a DS which in itself won't save as much money as losing a DI.
IF (and I think it is a big IF) he was actually given the decision to make, it would be "You need to make £30,000 of savings" or whatever, not "one person".
Yes, I know there's LOTS about it that is completely unrealistic, but this is the one that's annoying me at the moment. 