Rod McPhee, TV Editor 16:17 ET, Apr 30 2021 LINE Of Duty fans are on tenterhooks for tomorrow as the finale of the cop thriller looks set to land the big fish they have been chasing – arch criminal H. AC-12 boss Supt Ted Hastings, played by Adrian Dunbar, has split the bad guys into sprats (small-time) and mackerels (big-time). 20 20 Supt Ted Hastings, played by Adrian Dunbar, has split the bad guys into sprats (small-time) and mackerels (big-time)Credit: BBC But creator Jed Mercurio has also sprinkled in quite a few red herrings, leaving viewers and the anti-corruption team the difficult task of landing the real catch.