All members of the British Army and Royal Flying Corps were awarded campaign medals if they served overseas. The National Archives holds the index and the medal rolls as well: they provide very brief details of service, such as regiment and theatre of war served in.

For a fee of £2.00 you can view digital copies of index cards to the medal rolls in DocumentsOnline.

British Armed Services: Campaign Medals, and other Service Medals

William Spencer, Medals: The Researcher's Guide (TNA, 2006)