Buckells could still be “H”, this scene just ties in to the idea that he was never a criminal mastermind, as AC-12 believed “the fourth man” to be, but instead an individual who did small favours for several organised crime groups.

Are buckles really h?

Line of Duty season six concluded tonight and BBC One viewers tuned into see Jed Mercurio reveal the fourth member of H being DS Ian Buckells (played by Nigel Boyle).

Who could be H in line of duty?

Who was revealed as H? An average of 12.8 million viewers tuned into the finale of the BBC crime drama hoping to finally find out the identity of the mysterious H. The highly anticipated episode unveiled that DSU Ian Buckells (played by Nigel Boyle) was the criminal mastermind H all along.