Related Clues:

• Guidelines for conduct in the thick of battle
• Principle of the characters in command
• Code of behaviour set down by first army officer?
• Principle of working Protestants: 'Call back in an hour'? Quite the reverse!
• Changing the 99 rules of behaviour
• Code in English almost impenetrable?
• Formal code could be a 24 down in the making
• Poor clot breaks the rules of etiquette
• Cool port to be drunk, which is by the rules
• System of rules of behaviour
• Procedure or system of rules
• Moral rule
• Mores
• Professional to telephone, reportedly, on top of watching Ps and Qs
• Elizabeth I certainly demonstrates this principle