For the Precedency due to Officers in the army and navy an Army List and a Navy List should be consulted to determine the precedency due to each in the separate Services.
Officers should be sent in to Dinner according to the dates of commission, but no branch of the Army takes precedence over the other as regards rank of officers; that is to say, a colonel of 1901, of say, a West India regiment, would precede a colonel of Guards, artillery or cavalry of 1902 promotion. Drawn up on a brigade parade, the cavalry take the right of the line; thus: Artillery, Royal Engineers, footguards and regular regiments, regiments and West India regiments, in the order named in the Army List.
As regards Precedency between Officers of the combined Services a table of "Relative Rank and Precedency in the Army and Navy" should be consulted, as a captain in the navy after three years' service ranks with a colonel in the army, a lieutenant of the navy of eight years' standing ranks with a major in the army, and a lieutenant under that standing in the navy, ranks with a captain in the army, etc.
Consulate officers also take precedence according to seniority of service in England and date of official arrival. The Foreign Office List of the current year should be consulted for date in each instance.
As regards the Precedence due to Widows bearing titles who have married again: The widow of a peer married to a commoner retains her title by courtesy, and the precedency due to the title is accorded to her.