In February 2012, he was handed an indeterminate jail sentence over a terror plot, with the sentencing judge saying he should not be released until he was no longer a threat to the public.

However, this sentence was quashed at the Court of Appeal in April 2013 and he was given a 16-year jail term.

Khan was released from prison in December 2018 on licence, having served eight years of his sentence – including time spend on remand…

Sky’s Home Affairs correspondent Mark White has been told by sources that Khan was being monitored with an electronic tag when he was released from jail a year ago and had links to Islamist terror groups.