Possible Clues:

• In which Hants police left unrecognisable?
• Cops might wear them to break up Chilean plots
• Presumably keeps a lid on True Detective in unfashionable wardrobe department
• Police outfit pins the local criminal
• Common-or-garden college and seedy hostels designed for acting detectives perhaps
• Out of uniform
• Common-or-garden college and seedy hostel designed for those concealing identity
• All the cops in new uniform? Wrong!
• Mufti