To all my Messmates salutations.

It would seem that their Lordships of the Admiralty have noticed some quality in me that I have not seen in myself and have promoted me to Captain.
I, therefore, cordially invite you all to the Wardroom to help me polish off the meager store of liquor which I have stashed away there.

We will then adjourn to the Star and Garter by way of Mrs. Miggins' pie shoppe for a right old Sods Opera.
Do please join me in this escapade.
yr most humble friend Bligh.