Blackstone's Police Operational Handbook 2018Police National Legal Database (PNLD), Mark Hartley, Clive Harfield, Fraser Sampson · First published 2017Open the Tome
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Blackstone's Police Operational Handbook 2016Police National Legal Database (PNLD), Ian Bridges, Fraser Sampson, Clive Harfield · First published 2015Open the Tome
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