Thanks for both of the replies. On looking closer at the pension papers I have it does say 3/1 County of London Yeomanry, so on that basis it looks like he probably spent some or most of 1916 in Dublin maybe at the time of the Easter Rising.
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"Cavalry Reserve Regiments (United Kingdom)
Although nominally cavalry, many of the drafts ended up being converted into infantry in order to satisfy the manpower demands of trench warfare.
Despite being training and not combat formations, several were involved in the putting down of the Easter Rising in Dublin in April 1916. A little after noon on Easter Monday, a mixed troop of 9th and 12th Lancers, attached to the 6th Cavalry Reserve Regiment at Marlborough Barracks inPhoenix Park, was dispatched to investigate a "disturbance" at Dublin Castle.[2] As they cantered down Sackville Street, they were fired upon by rebels who had taken up positions in and on the roof of the General Post Office. Three troopers were killed instantly and one was mortally wounded, becoming the first military casualties of the rising. The same evening, 1600 men of the 3rd Reserve Cavalry Brigade (consisting of the 8th, 9th and 10th Cavalry Reserve Regiments) arrived from their barracks at the Curragh to support the local Dublin garrison.[3]
6th Dublin
5th (Royal Irish) Lancers
12th Lancers
City of London Yeomanry
1st County of London Yeomanry
B Sqn comprised mainly of a draft of 160 NCOs and men from 3/1st Welsh Horse Absorbed into 1st, 1917"
"3/1st County of London Yeomanry
• Formed in April 1915 as a "third line" (training, draft-supplying reserve for the 1/1st and 2/1st) and located at Ranelagh Park.
• 1916: affiliated to 6th Reserve Cavalry Regiment at Dublin.
• Early 191 7: absorbed into 2nd Reserve Cavalry Regiment at the Curragh"
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After he was posted to the Royal Fusiliers he was eventually wounded on 26th Sept 1917 during the attack on Hill 40 near Zonnebaeke during the battle for Polygon Woods.
Thanks again
Paul