Most importantly, the games went off without a single major security incident, quelling fears that began the day after London won the right to stage the games, when the July 7, 2005 terrorist attacks killed 56 and injured more than 700.

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"All of the imams that I have spoken to after 7 July have condemned the attacks and that is what they are preaching in prison, " he told BBC Radio 4's Today programme.

BBC: NEWS | UK | Do prisons radicalise inmates?

It was a few days after the London bomb attacks on 7 July 2005 and Mr Russell was classed as missing.

BBC: Obituary: Philip Russell