Having gone through the entire thread I can see that myself and Alan agree that he either served in the 1/5 or 2/5 Warwicks. As Alan said he did not qualify for a 1915 Star as he would have done if he went to France with the 1/5th in March 1915.
However, when the second line Territorials were formed around October 1914 a nucleus of officers, nco's and other ranks were transferred from, for example,. the 1/5 to the newley formed 2/5 for training purposes.
I do not have any info regarding the 2/5 Warwicks war service, but, I do have a copy of the book 'Black Square Memories' which is the account of the 2/8 Royal Warwicks in 1914-18. This helps as the 2/5, 2/6, 2/7 and 2/8 were all in the same Brigade. i.e. the 182nd Brigade of the 61st Division.
At the beginning of September 1916 the 61st Division moved to Levantie and were in the Fauquissart sector and it was very quiet sector (though casualties still occured)
In September 1917 the 182nd Brigade were in the Arras/ Roeux area and were in the trenches known as the 'Chemical Works Sector'
Terry