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The notorious Islamist hate preacher Anjem Choudary will be banned from leaving London after his release from prison to stop him from radicalising others around Britain.

He will also be barred from going to London’s St Pancras station and City Airport to prevent him attempting to flee overseas to promote the jihadi cause.

The restrictions are among 25 licence conditions that will be imposed on Choudary when he is freed on Friday after serving half of the five and half year sentence given to him at the Old Bailey in 2016 for inviting support for the Islamic State.

They will form part of a huge security operation, which will also involve monitoring by MI5, counter-terrorism police and probation staff, which has been prepared in recognition of the role that Choudary has played in inspiring some of Britain’s most dangerous terrorists.

They include the London Bridge killer Khuram Butt, the murderers of Fusilier Lee Rigby, Michael Adebolajo and Michael Adebowale, and the suspected IS executioner Siddhartha Dhar.

Prisons minister Rory Stewart told this newspaper last month that Choudary, 51, remained a “genuinely dangerous person” whom the Security Service and police would have “to watch like a hawk” to stop him from inciting further violence.

An extensive list of controls will be applied as a result, including the ban on going outside the M25 which will confine him to the capital.

Other requirements will prohibit Choudary from contacting anyone he knows or believes to have been convicted of an extremist offence or anyone associated with a list of more than extremist organisations, including IS, al-Qaeda, the al-Muhajiroun group that he founded, and its offshoots such as Need4Khalifah.

Another condition will specifically bar him from any contact with Mohammed Mizanur Rahman, the London extremist previously jailed for soliciting murder with whom he was convicted in 2016.

Any radicalising, preaching or similar grooming activity, including talking to children, will be similarly outlawed. Nor will he be allowed to organise meetings, speak to the media, or attend certain mosques.

Choudary will also banned from using any smartphone, laptop or other internet-enabled device without permission from the authorities and subjected to examination of his search history on any occasion that he is given the go-ahead. He will have to hand over the solitary phone that he will initially be allowed for inspection whenever requested.

He will live under curfew in “approved premises” – a form of secure hostel – in London to enable him to be monitored closely.

Any breach of the conditions, which will potentially last until July 2021, will allow him to be taken back into prison to serve the remaining portion of his sentence.

Sources said that the decision to keep Choudary in London, rather than moving him to another part of the country, was based partly on the presence here of his family.

Another key reason is the expertise of the Met and London probation staff at dealing with high-risk offenders and their greater capacity for coping with dangerous extremists.

Preventing him from leaving the capital is also intended to allow the threat he posed to be contained and to avoid the risk that Choudary, who has previously helped to create extremist hotbeds in towns such as Luton and Crawley, might spread radicalisation elsewhere.

The ban on going to St Pancras or City Airport, which is backed by a further prohibition on visiting any other port and the confiscation of his passport, is similarly intended to stop Choudary going abroad to promote extremism.

Although some observers have previously expressed a wish to see such extremists leave this country, ministers and counter-terrorism officials believe this approach would heighten the long term danger to Britain and other countries.

Choudary’s release, which comes at a time when terrorism investigations and arrests are running at record levels, will nonetheless be a blow to counter-terrorism police.

They made ten failed attempts to prosecute him before his conviction in 2016 and have expressed frustration at his ability to evade justice despite his role in radicalising large numbers of Britons.

The former terrorism watchdog, Lord Anderson, highlighted the problem last week when he told Parliament that “as many as 25 per cent of British jihadis convicted between 2001 and 2015” were “associated with” Choudary’s organisations, “outnumbering the 10 per cent linked to al-Qaeda and the 5 per cent linked to ISIS [Islamic State]”.

Legislation intended to make it easier to prosecute future radicalisers is now passing through Parliament despite some opposition from MPs and campaigners.