Although it is known in the usual way--that is, from chance references in despatches and at courts-martial--that many such sets of Additional Instructions were issued, only one complete set actually in force is known to exist.

They are those signed by Admiral Boscawen on April 27, 1759, in Gibraltar Bay, and are printed below.
After his capture of Louisbourg in the previous year, Boscawen had been chosen for the command of the Mediterranean fleet, charged with the important duty of preventing the Toulon squadron getting round to Brest, and so effecting the concentration which the French had planned as the essential feature of their desperate plan of invasion.

He sailed with the reinforcement he was taking out on April 14, and must therefore have issued these orders so soon as he reached his station.

There is every reason to believe, however, that he was not their author; that they were, in fact, a common form which had been settled by Lord Anson at the admiralty.

In the shape in which they have come down to us they are a set of eighteen printed articles, to which have been added in manuscript two comparatively unimportant articles relating to captured chases and the call for lieutenants.
These may have been either mere 'expeditional' orders, as they were called, issued by Boscawen in virtue of his general authority as commander-in-chief on the station, or possibly recent official additions.