Iran posted a video of Mr Akbari earlier this week showing what appeared to be forced confessions, and after the country's intelligence ministry had described the British-Iranian as "one of the most important agents of the British intelligence service in Iran".Human rights group Amnesty International called on the UK to investigate claims Mr Akbari was tortured before his death.Dr Sanam Vakil, Iran expert at international affairs think tank Chatham House, said Mr Akbari's death would be used by the Iranian regime to suggest a "heavy outside hand" was stoking the anti-government unrest - linking the protests with the accusation that Western nations were trying to "destabilise the Islamic republic"."Keeping the narrative of the West being involved is a way to maintain unity among the political establishment," she told BBC Radio 4's Today programme.Ties between the UK and Iran have deteriorated in recent months since London imposed sanctions on Iran's morality police and other top security figures, in response to the country's violent crackdown on anti-government protesters."