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Other nominees include Rivals, a Disney+ adaptation of a Jilly Cooper novel about two powerful men battling for control of a local TV network, and Slow Horses, about a dysfunctional unit within MI5 made up of disgraced agents.

Last October, Sir Ken McCallum, director general of MI5, said there had been a sharp rise in state-linked threats to the UK - including 20 linked to Iran since January 2022 which had posed "potentially lethal threats to British citizens and UK residents".

Last year MI5 said it had responded to 20 Iran-backed plots since January 2022.

Two years earlier, MI5 warned an alleged Chinese agent, Christine Lee, had infiltrated Parliament to interfere in UK politics.

Mr Donaldson had worked for Sinn Féin and was shot dead in Donegal in 2006, months after admitting his role as a police and MI5 agent for 20 years.