Watson also served in a number of others roles including Aide-de-Camp to Her Majesty Empress Victoria, 1870–71 and the Agent to the Governor-General at Baroda from 1882 until 1886, for which he was subsequently knighted as a Knight Commander of the Order of the Bath (KCB) in 1886. He was promoted to a Knight Grand Cross of the order (GCB) in the 1902 Coronation Honours list published on 26 June 1902, and was invested by King Edward VII at Buckingham Palace on 8 August 1902.