My great grandfather, John Williams, enlisted in the Royal Welsh Fusiliers (TA) in July 1920 in Holyhead. His enlistment form shows that he had previously been in the Welsh Regiment and was discharged in May 1920, but I can't find any further information on this.
His army number in the Welsh Regiment was 85741
He was born around May 1900 in Holyhead
Any help finding information about his time in the Welsh Regiment would be appreciated.