I have located Arthur's MIC. His service numbers were:
GS/18118 (the 'GS' prefix was used by many regiments 'General Service')
and
L/10935 (the 'L' prefix was used by many regiments also, but in this case would indicate his service with the Lancers Regiment).
He was awarded the following medals:
Victory Medal (authorised in 1919 and awarded to all eligible personnel who served on the establishment of a unit in an operational theatre).
British War Medal (authorised in 1919, and awarded to eligible service personnel and civilians. Qualifications for the award varied slightly according to service. The basic requirement for army personnel and civilians was that they either entered a theatre of war, or rendered approved service overseas between 5 August 1914 and 11 November 1918. Service in Russia in 1919 and 1920 also qualified for the award.
The absence of the
1914 Star or
1914-15 Star on his medal card indicates that he did not see service ashore in France and Flanders between 5 August and 22 November 1914, or service in France and Flanders from 23 November 1914 to 31 December 1915, or service in any other operational theatre from 5 August 1914 to 31 December 1915, which could possibly add further weight to the bodyguard theory.
Have not yet been able to locate his service records... chances are they did not survive the Blitz
