Bomb-making guides were found at the East London home of the bright 16-year-old (file photo)

A British teenager who tried to flee to Syria after being radicalised in a family home ‘saturated’ with Islamic State propaganda is set to return to her parents – despite a judge saying she is a ‘significant risk’.

Bomb-making guides, images of beheadings and plans of MI5 headquarters were found at the East London home of the bright 16-year-old, where her Algerian-born father had let her watch ultra-violent material so often that she became numb to its content.

The girl, who cannot be named, had planned to join Islamic State in December 2014 to become a jihadi bride, but was detained on a Turkey-bound aircraft at Heathrow.

She was put into care by High Court judge Mr Justice Hayden last year after it emerged her father and mother – described as zealous and controlling – lied about her viewing disturbing propaganda.

But last week the judge reversed his decision, saying her parents were now aware of their destructive influence.