www.prufospolicedatabase.co.uk
Click on the above link for the PRUFOS (Police Reporting UFO Sightings) Database which was launched publicly in the January 2002 issue of UFO Magazine.
The current figures are approximately 500 cases between 1901-2015 involving over 1000 Brtish police officers.
The site records and collates British police officer sightings in two categories - ON and OFF duty sightings.