City worker who swapped board room for classroom up for $1M innovation prize

When Colin Hegarty quit his job in the city years ago to become a teacher he didn't imagine it was a move that would put him in the international spotlight.

Hegarty took a £40,000 pay cut when he left Deloitte and trained to become a maths teacher, taking up a job at Preston Manor school, an academy in Wembley, west London.

This weekend he is in Dubai, waiting to hear if he is the winner of the Global Teacher Prize, after developing a maths-teaching aide that is being used by a total of 5,000 children a day across 200 countries.

He's the only Briton in the running - and if he wins he'll be awarded more than half a million pounds. Rajiv Popat reports.