scotbill....The smaller the aircraft used the higher the price. Go and rent a navajo and a pilot to do the same 45min trip if you think like that.
It's not unusual for small short domestic routes to be as expensive as a long haul flight. If people want to get there fast and comfortable then fly, next step down probably the train, however if you want to pay £25.99 may I suggest you catch the bus or drive yourself.