The only record I could find is this:
British Army World War I Service Records, 1914-1920
Name: Thomas Liddle
Gender: Male
Enlistment Age: 20
Birth Place: St Oswald, Durham, England
Military Date: 1909
Regimental Number: 445
Regiment Name: 4th Northumbrian How: BDE??
Occupation was a Miner and he was employed by Wallsend & Hebburn Coal Company. However, in the 1921 census there appears to be two Thomas Liddle's living in Hetton-Le-Hole. One was married to an Isabel and the other (yours) was Jane. Both give the same address for the company they work for but home address is different.
Occurding to FreeBMD only one Thomas Liddle was born in Durham.