Possible Clues:

• Dressed to kill, perhaps, either sex established
• Like Mr Plod - ignorant, lacking direction
• Like a soldier at the front not told indefinite number missing?
• Soldiers will be this ignorant having lost one source of news
• Like most police, kept in the dark when second note goes missing
• Like an officer without a name, ignorant
• I'm choosing higher education, finally dressed in regulation gear?
• Got up as prisoners? Later indefinite number escaping in the dark
• Immature about one being dressed for duty
• Wearing special clothes made near Cambridge?