“Alireza was convicted of the supposed crime of spreading corruption on earth, which we’ve repeatedly condemned for falling far short of international legal standards.

Source: https://www.barryanddistrictnews.co.uk/news/national/23251190.human-rights-campaigners-hit-irans-execution-alireza-akbari/?ref=rss

In the UK foreign office's statement, the recent execution of Alireza Akbari, a UK spy in Iran has been mentioned as the reason in addition to the crackdown on recent riots in the country, which were provoked by the Western states in Iran.

Source: https://en.mehrnews.com/news/196544/UK-announces-new-sanctions-on-Iranian-figures

On Saturday, Iranian media said former Defense Ministry aide Alireza Akbari was executed for spying.

Source: https://newsinfo.inquirer.net/1718046/irans-death-committee-president-unyielding-in-defense-of-clerical-rule

"Sanctioning him today underlines our disgust at Alireza Akbari's execution," UK Foreign Secretary James Cleverly said.

Source: https://www.bbc.co.uk/news/world-middle-east-64273969?at_medium=RSS&at_campaign=KARANGA