batman to Sassoon

Hello all,
I have been on the phone to Graham Knight re an old thread concerning the batman of Sassoon. I wrote to the Sassoonery Society and a name was given to me by Debbie Fisher.But Graham Knight has since read a letter in a Birmingham news paper and the correspondent has named a different man who acted as batman for Sassoon. He is Patrick Fahey number 7792 he liked his booze and he probably served Sassoon from 1915?? Fahey was discharged from the army on the 4/6/1916, as time ex. What do you all reckon?
R B D

Private Patrick Fahy 7792 1st & 2^nd Bn RWF Born 1881 Walsall Staffordshire, son of Michael and Mary of 7 Hill Street Walsall, enlisted into the 1^st Bn RWF at Lichfield on 8^th Aug 1903 stating his previous service with the 3^rd Bn South Staffordshire Regiment No 5685 from 24^th April 1900 until 19^th July 1902 serving in South Africa from 17^th June 1901 until 18^th July 1902 receiving the Queen’s South Africa medal with Clasp Cape Colony, SA 1901 and SA 1902. Patrick was Posted 2^nd Bn on 23^rd Nov 1904 and served in India until 7^th May 1906 and transferred to Army Reserve section B on 4^th June 1906; He married Gertrude Harris on 4^th April 1909 at Birmingham’s Register Office and lived with his wife’s family at 132 St Mark’s Road Ladywood Birmingham; Recalled to the Colours and mobilized at Wrexham on 5^th Aug he was Posted 2^nd Bn and went to France on 10th Aug 1914. On the 3^rd Nov 1915 he was awarded 28 days FPNo1 for drunkenness having his sentence cut short he then was Posted 1^st Bn on 28^th Nov 1915 and QM Joe Cottrill got his sentence cut short by a few days so he could have him as his batman
Sassoon wrote in one of his books that Cottrill had pinched his servant (I have read the book but forgot which one it was in )
Fahy was discharged as Time Expired on 4^th June 1916 going back home to his wife and three children Albert, Dora, and Olive at 13 Alexandra Road Ladywood Birmingham where he lived until he died of consumption in 1936.
He wrote in one of the Birmingham newspaper of 1920 that he had been Sassoons batman