British Army First World War service records (catalogue reference Series WO 364) including those of soldiers discharged on account of sickness or injuries sustained during the War, are available to download from Ancestry.co.uk for a fee. You can access these images free on site at The National Archives in Kew.

It is essential when using these records to have as much information about the soldier you seek.

You may find some additional information in the medal rolls.

British army soldiers' papers: First World War, 1914-1918

British Army War Diaries: First World War, 1914-1918

William Spencer, Army Service Records of the First World War (PRO, 2001)