United Kingdom Parliament
Privy Council: The Rt Hon
All Cabinet Ministers of the United Kingdom Parliament are members of the Privy Council. Other Ministers outside the Cabinet may also be admitted to the Privy Council. It is an appointment that is held for life.
Some junior Ministers of any particular administration may not be admitted to the Privy Council, but most of these are Members of Parliament, and others may have seats in the House of Lords.
Privy Counsellors have the prefix 'The Rt Hon' before their names. Mr is dispensed with, but if a Privy Counsellor is also a knight, his style of address would be 'The Rt Hon Sir John Smith'. If the Privy Counsellor is female 'The Rt Hon' replaces Mrs/Miss/Ms in her style of address, but if she is also a dame, her style of address would be 'The Rt Hon Dame Elizabeth Brown'.
All Members of the House of Commons of the United Kingdom have the letters MP after their names.