How exciting! My dad is an antiquarian book dealer, and recently found a collection of letters sent by a soldier to his sweetheart (later wife) during World War One. It's amazing piecing together a bit of history from the objects that are left behind.
What website did you find the prisoner's name on, out of interest?
It's the best feeling!
https://www.angloboerwar.com/other-information/89-prisoner-of-war-camps/1839-camp-for-boers-ceylon-sri-lanka
Thanks!