Hi Kevin.
I've a quick look and come up with the following (in no paricular order) which may help:-
Looks like Percy enlisted on 25/5/1915 (aged 32) into the 4th Glos. Service number 288040
His address at enlistment is given as 56 North Bar, Banbury.
He was a carpenter/wheelwright and employed by Burrows & Co of Cherwell Works, Banbury.
He was discharged in March 1919 having served for 9 months in Italy, 9 months in France, and 30 months in England.
3 August 1917 he was transferred to 46 IBD (Infantry Base Depot), given a new service number of 238018 and joined the 7th Worcs. He retained his rank as Sergeant (drummer from earlier).
Looks like on the 6 July 1918 he transferred to 1/6th Glos.
Other notes show that he complained of lung trouble, had some teeth loss, and suffered with 'piles'. These were blamed on 'Active Service Conditions'. In March 1917, he had scabies and was confined to the barracks 'scabies hut'.
There are also some names and dates noted.......Married Mar 1903, Gladys 28/6/03, Dorothy 11/10/04, William 16/08/07, ?? 5/9/14 and Frank 18/12/16 (are these relatives????)
Good luck.
Andy