Hello Charlie,
Re; John Alfred Stokes, 2/6th Battalion, Manchester Regiment.
My grandfather served with the 2/6th from joining up until he was wounded, 1917/18. I don't have the information of when and where in France he was wounded, but I think he was wounded in 1918 rather than 1917.
If you search "John Alfred Stokes, Dog Tags", you will see in the third photograph down, he is seated next to a soldier from the Grenadier Guards.
My grandfather is clearly wearing his cap with Manchester's cap badge.
This photograph was taken while he was to be recovering from his wounds, presumably at some large country house in the UK.
In my earlier note, I stated that he was transferred to The Welsh Regiment, but never actually joined them before the war ended and he was demobbed.
He was with the 2/6th from the day he joined up, until the day he was demobbed. I don't know where the 21st Battalion service came into his record.
Geoff.