Ivor,
He has two medal index cards. The other one is under Gerald Body, but they are virtually identical.
He was a Territorial, 5th Battalion, probably pre-war and went overseas as Private 1440 with 1/5th Bn, probably via India with the original draft and on to Mespot as shown on his 15 Star details. He must still have been with them early 1917 as he also has the six digit service number.
http://www.1914-1918.net/buffs.htmAccording to the MIC he was commissioned into the Buffs, but I can't find an entry in the London Gazette to confirm or date it.
His RAF details are also eluding me. The RAF was formed in April 1918. If you know that he was in the RFC, then it may have been on attachment.
His British War and Victory medals were issued by the RAF. His Star was issued by the Army 18/5/21. It looks like the application for his medals was made late 1920.
I can however pick him up post war and as you say he was back in the Buffs. These four LG entries chart his later career, from re-establishment in the Buffs, through to promotion to Lieutenant, resigning his commission and finally to re-enlisting in the ranks.
http://www.rootschat.com/links/0gui/Phil