John Kenny, a regular soldier or not?

I am researching my great uncle John Kenny 3rd Bn Worcestershire
regimental no. 13799. He died of wounds 14 July 1916 and is buried at Etaples Military Cemetery.
As trawling through Ancestry has drawn a blank re. service records, can I ask whether the regimental number was as a regular or was he transferred as new army to the battalion sometime before July 1916.
Someone somewhere must be able to help me!!!!!
regimental no. 13799. He died of wounds 14 July 1916 and is buried at Etaples Military Cemetery.
As trawling through Ancestry has drawn a blank re. service records, can I ask whether the regimental number was as a regular or was he transferred as new army to the battalion sometime before July 1916.
Someone somewhere must be able to help me!!!!!