Article 11 Discharge of chief officer’s functions
Any of the functions of a chief officer of police under the principal Act may in the event of his illness or absence, or of a vacancy in the office of the chief officer of police, be discharged—
(a)
in the City of London, by an Assistant Commissioner of City of London Police; and
(b)
in the metropolitan police district, by an Assistant Commissioner of Police of the Metropolis.