The Police

If you would like to contact the police, the numbers are always available on the Useful Numbers tab here on the blog.

...  but just in case:
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City of London Police
Control room (24 hour): 0207 601 2222
Bishopsgate police station (24 hour): 0207 601 2606
Barbican Estate police station (office hours only): 0207 601 2456
... and of course 111 for a non-emergency and 999 for an emergency
See also the City of London Police Reporting a Crime page.