Each police force shall keep written records showing on an annual basis—
the number of persons kept in police detention for more than 24 hours and subsequently released without charge;
the number of applications for warrants of further detention and the results of the applications; and
in relation to each warrant of further detention—
the period of further detention authorised by it;
the period which the person named in it spent in police detention on its authority; and
whether he was charged or released without charge.
Every annual report—
under section 22 of the Police Act 1996; or
made by the Commissioner of Police of the Metropolis,
shall contain information about the matters mentioned in subsection (1) above in respect of the period to which the report relates.