A former governor of a group of schools at the centre of the so-called “Trojan Horse” affair has spoken of how her 19-year-old son was radicalised by Islamic extremists and eventually died fighting with Isil in Syria.

Nicola Benyahia was among a group of board members from the Park View Educational Trust in Birmingham who stood down in July 2014 at the height of the uproar into allegations that hard-line Muslim groups had attempted to infiltrate schools in the city.

An official review by the former Scotland Yard counter-terrorism chief Peter Clarke concluded there was "disturbing" evidence of attempts to take control of schools to spread an ultra-conservative brand of Islam, leaving children "vulnerable" to radicalisation.