The fact that the Jersey is to continue but not the Balkan or Thompson seems to firmly point to this being a cost cutting measure, probably around fire cover - especially if the BE sticks to its mid-afternoon schedule, slap bag in the middle of the gap between the morning and evening KLM, so you can't even lock uo the terminal for the duration (do you even need the terminal building any more for less than 100 pax at a time - couple of posh portakabins?)
Also only pax flights (those on an AOC with over 19 pax?) need fire cover, otherwise at your own risk.