Lieutenant and Sub Lieutenant

The exact rank is given on the envelope or in a list. These ranks should not be abbreviated.

The recommended social style of address is as follows:

Beginning of letter	Dear Lieutenant Smith
End of letter	Yours sincerely
Envelope	Lieutenant John Smith, CBE, RN
Verbal communication	Lieutenant Smith*
Invitation	Lieutenant John Smith
Description in conversation	Lieutenant Smith
List of Directors or Patrons	Lieutenant John Smith
Place card	Lieutenant John Smith

*A younger man, or a more junior officer in any of the Armed Forces, addresses him as 'Sir'.

The recommended social style of address is as follows:

Beginning of letter	Dear Mr Brown
End of letter	Yours sincerely
Envelope	Sub Lieutenant John Brown, RN (this rank should not be abbreviated)
Verbal communication	Mr Brown*
Invitation	Mr John Brown
Description in conversation	Mr Smith
List of Directors or Patrons	Mr John Brown
Place card	Mr John Brown

*A younger man, or a more junior officer in any of the Armed Forces, addresses him as 'Sir'.

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