Having had a little dig at Aurigny, who I am sure are no worse than many other airlines with this problem, I feel it is only fair to balance my observations towards them.
I have never flown with them before but found them to be efficient, comfortable and friendly. I would happily use them again. There was a delay on the return flight but that was due to an earlier bomb scare at Guernsey Airport so the airline cannot be blamed for that.
What particularly impressed my wife and me was the care afforded to two unaccompanied minors on the flight. They were a boy and girl of about 11 and 12 (presumably brother and sister) and they were seated opposite us.
Prior to the flight we noticed how the Aurigny staff in the deparure lounge kept a friendly eye on them explaining the reasons for the delay. They were escorted to the aircraft and during the flight the cabin staff made sure they were problem free.
At Bristol we parked on a remote stand and the Servissair rep met the youngsters from the aircraft and put them on the huge airport coach. Not only that but they were put in seats up front alongside the driver. Their faces were a delight to behold at this, and they then enjoyed the long drive along Bristol's circuitous apron road route as the coach threaded its way around about a dozen parked passenger aircraft. They were escorted through the arrivals hall but we then lost sight of them.
Well done to all concerned. It would have been a relief to the childrens' parents/guardians to know how well their youngsters were looked after.