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Glyn School in Ewell, Merstham Park in Redhill and Rosebery School in Epsom are to take part in the pilot.

Gemma Devonish, who worked as head of year at Rosebery School in Epsom, Surrey, died at the scene in Nutfield Close, Carshalton, the Metropolitan Police said.

Rosebery School previously said staff and pupils were "devastated by the sudden and unexpected death".

James Greaves, 19, of Hatt in Cornwall, was sentenced to three and a half years in a young offender institution with Taylor Rowsell, 18, of Rosebery Road in Exmouth, Devon handed a two year sentence.

One of his predecessors in Downing Street, Lord Rosebery, once said having a former prime minister in cabinet was "a fleeting and dangerous luxury".