The London Gazette July 24th 1860
The Queen has been pleased to grant unto David Souter Robertson, formerly David Robinson Souter, of Whitchill, in the county of Larnark, Lithgow, and of Lawhoad ? LawHead? In the county of Larnark, one of her majesty's Deputy Lieutenants for the county of Larnark and Bute, her Royal licence and authority, that he and his issue may continue to use the surname Robertson after that of Souter.
And to command that the said Royal concession and decoration be recorded in Her Majesty's College of Arms, otherwise to be void and of none effect.
Whitehall July 16 1860.
Also found in the book: Seekers of truth: The Scottish Founders of Modern Public Accountancy the following:
David Souter Robertson was Stockbroker in London and a Captain in the Royal Scots Militia who Volunteered for the Zulu war in 1879 and was decorated in this campaign. He remained married in South Africa.
Captain George Newcombe Stevenson 91st Highland Regiment and son of George Robert Stevenson, a Justice of the peace in Kent. He and Anne had two daughters.
David's brother Thomas Robertson Souter (late Chaplin) attended the University of Edinburgh, was a Captain in the Highland borders Light Infantry Militia, and then Black Watch, and became a Photographer and an Artist in London.