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The UK\\u2019s \\u2018strictest\\u2019 headteacher Katharine Birbalsingh has landed a new role as head of the Social Mobility Commission, a public body designed to boost the life chances of the country's most disadvantaged children.

Born to Jamaican and Guyanese immigrants, Katharine Birbalsingh first rose to prominence at the 2010 Tory party conference. Her speech about Britain\\u2019s \\u201cbroken\\u201d education system received a standing ovation, but it also made her one of the most controversial figures in British education, and for a while she couldn\\u2019t even get a teaching job.

Then, in 2014, she founded the Michaela free school in north-west London, which has a zero tolerance behaviour policy. Pupils are penalised for forgetting to bring a pencil, or even for talking in corridors between lessons. The school has been deemed \\u201coutstanding\\u201d in all areas by Ofsted inspectors.

Edward Stourton examines the life and career of Katharine Birbalsingh, and asks if her forthright personality and achievements as a headteacher will equip her to address issues of entrenched inequality.

Producer: Nick Holland\\nResearcher: Bethan Head