If you enjoy www.victorianlondon.org why not ...

The City of London has its own police; a body, though distinct, not altogether dissimilar to that already described as doing duty in Westminster; their attendance is both day and night, but is entirely under an arrangement peculiar to the City, and to its protection only it is confined. The City police is under the control of a chief commissioner (who sits daily at Guildhall), to whom complaint may be made in any case of misconduct upon the part of its officers.