Sourced from the National Archives at Kew in England, were they are catalogued under WO 329, they include details such as name, rank, unit, and possibly other service details.
Here's the TNA description as presented on Ancestry:
The volumes in this series record the entitlement to medals and awards of men and women serving in some capacity during the First World War. Most pieces concern those serving in the Army. Some, however, refer to the Royal Flying Corps/Royal Air Force (RFC/RAF); to civilians in military establishments, e.g. doctors and nurses in hospitals; to people mobilized for other war service, e.g. in colonial labour corps; and to allied personnel who assisted British soldiers behind enemy lines.
The volumes also give the date the issue was approved and record the issue, or cross-refer to another issuing body, e.g. the Air Ministry for some members of the RFC/RAF receiving the British War and Allied Victory Medals.
The medals and awards concerned are:
- The British War Medal;
- The Allied Victory Medal;
- The 1914 Star (the Mons Star) and bar added in 1919;
- The 1914–15 Star;
- The Territorial Force War Medal;
- The Allied Subjects Medal.
Further details on the site.
My next Scotland 1750-1850: Beyond the Old Parish Records online course starts on November 5th, and runs for 5 weeks, priced at £45.99. Spaces are still available - see http://pharostutors.com/coursedescriptions.php#302