Line of Duty has taken to Twitter to publicly defend last week's grand finale of season six, after many viewers branded it a 'let down'. On Sunday night, the identity of bent copper 'H' was unveiled as DCI Ian Buckells, and many LOD fans were left angry at the 'anticlimax'.Creator Jed Mercurio and the cast of the show have been left with no choice to defend the ending on social media as people are still talking about it.Taking to Twitter, Mercurio wrote: "1.