The 2010 book '' Stab Proof Scarecrows '' is written by a former police constable who served with both Kent and The City of London Police . It is highly critical of both Kent Police and the situation of policing in general . In 2010 then-Assistant Chief Constable of Kent Police , Allyn Thomas sent a letter to every officer in the force reassuring them that senior officers did not give the book any credibility . In 2006 , Kent Police dealt with the biggest cash robbery in the history of British policing - the Tonbridge Securitas depot robbery . Kent police investigated the theft of £ 53m , with six men being sentenced to a total of 156 years imprisonment
Tonbridge Securitas depot robbery
Securitas depot robbery
Kent Police