Hi Helen
When he joined up he would have gone to any of the Infantry Training Unit (4th Brigade) from there he joined the 19th of Foot (The Green Howards) Princess of Wales's Own Yorkshire Regiment of Foot.
This Regiment just like a lot of other units of the British Army had more then one Battalions 1/19th 2/19th.
The Two Howards
The Regiment was known as the Green Howards from 1744. At that time, regiments were known by the name of their colonel. The 19th regiment's colonel was Hon. Sir Charles Howard. However, at the same time the 3rd Regiment of Foot had been commanded by its Colonel Thomas Howard, since 1737. In order to tell them apart (since they both would have been known as 'Howard's Regiment of Foot'), the colours of their uniform facings were used to distinguish them. In this way, one became 'Howard's Buffs' (eventually simply The Buffs), while the other became the Green Howards. Although the Green Howards were referred to unofficially as such from then on, it was not until 1921 that the regiment was officially retitled to the Green Howards (Alexandra, Princess of Wales's Own Yorkshire Regiment).Under the Childers reforms all non-royal English infantry regiments were to wear white facings from 1881. In 1899 the regiment was able to reverse this decision with the restoration of the grass green facings formerly worn by the 19th Foot.