The Metropolitan police has won its battle to stop attending most of the mental health calls it receives after a tense behind-the-scenes row with the health service, the Guardian has learned.

From 31 October the Met will start implementing a scheme that aims to stop officers being diverted from crime fighting to do work health staff are better trained for.

In May, the Guardian revealed that the Met commissioner, Sir Mark Rowley, had written to health and social care leaders setting a deadline of 31 August – leading to furious reaction from health chiefs who wrote to the commissioner protesting that it would put vulnerable people at risk.