(UPDATED) The MoD said on Sunday 24 Sept that it had accepted a request from the Home Office, under Military Aid to the Civil Authorities (MACA), to "provide routine counterterrorism contingency support to the Metropolitan Police, should it be needed".
The linkage of the request to counterterrorism support excluded the use of armed defence personnel for armed police duties not connected to counterrorism.
The Met said the next day that the Army had been 'stood down' because enough of their own officers had returned to firearms duty.