Derby Airways and Intra did Jersey and Isle of Man with a Dak. There were various regular Jersey charter operators, including BMA Viscount and Herald, Guernsey Airlines Shorts 330, Brymon Dash 7 and later Dash 8, Titan Shorts 360 and ATR 42, Aurigny Shorts 360.
In the early 90's Orient Air did Waterford and Dublin with a PA31 and latterly a Bandit. When they folded ATS Vulcan carried on with a Bandit for a bit. Air Atlantique offshoot, Air Corbiere did Jersey/Coventry with a Caravan II.
Now, of course, it's Manx doing IOM/BHD/JER with a Dornier 228 or a Metroliner