Counter-terror thinktanks call for inquiry into public library stocks after a Channel 4 News investigation finds hundreds of books written by radical Islamist preachers, writes Johnny McDevitt.

Among the authors was the first person to be banned from entering the country by the Coalition Government earlier this year.

Works by Zakir Naik as well as other banned Islamist leaders, such as Yusuf al-Qaradawi, Abdullah Al-Faisal and Bilal Philips, are available to borrow across London's libraries.

Indian televangelist Naik was barred from entering the country in June, after Home Secretary Theresa May uncovered comments attributed to him, which she said represented "unacceptable behaviour".

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