The West India Regiment was part of the British Army, so many of the relevant documents are held in London at the (British) National Archives. If you haver most of his military details, you can . digital records direct from the (British) National Archives.
Here are some links that look useful...
http://www.1914-1918.net/britishwestindiesregiment.htmlOn this page, there are some details you can use to help you... for instance in this snippet...
"Battalions formed by the regiment
1st Battalion
Formed at Seaford, Sussex, England from West Indies volunteers: A Company from British Guiana, B from Trinidad, C from Trinidad & St. Vincent, D from Grenada & Barbados.
Served in Egypt and Palestine.
War diary September 1915 - April 1919 (WO95/4427, 4433, 4410, 4732)"
...you have a direct reference to the War Diaries (War diary September 1915 - April 1919 (WO95/4427, 4433, 4410, 4732)) - and you will discover that all Archives just love to have all the numbers (it makes their job easier).
Here is Ainsley Harriot's WDYTYA page...
http://www.bbc.co.uk/whodoyouthinkyouar ... it_2.shtmlThis lists the Barbados Museum and Historical Society as a possible source of BWIR information, and I know the Library there does no research for a fee.
You will also notice that in various web pages the Regiment is loosely referred to as the British West Indies Regiment, the British West India Regiment, the West India Regiment and the West Indies Regiment,
In any case, it seems clear that the volunteers from Barbados were in the 1st Battalion, D Company - which served most of its time in Egypt.
Good luck!!
Jim