This short presentation by William Spencer, author of Medals: The Researcher's Guide, was originally given on 22 September 2009 at Kew. It focuses on how to find information on the WW2 period.
The London Gazette is a crucial source for announcements of awards giving information on name, award and sometimes a citation. Spencer's presentation explains how the Gazette information can be used to access other records, especially the recommendation that was submitted to justify why the award should be given. These are found in a variety of files depending on the award given.
Access at www.nationalarchives.gov.uk/podcasts/civilian-honours-and-awards.htm