Various reference services offered by the site and Institutions around the world.
British & Empire Prisoner of War Details
I own copies of the following reference books, Prisoners of War Armies and Other Land Forces of The British Empire 1939-45, Prisoners of War British Army 1939-45, and Prisoners of War Naval And Air Forces of Great Britain and The Empire 1939-45. Between them these rare books list every British and Empire serviceman who was a Prisoner of War in Germany up until May 1945. In many cases basic details are provided; rank, regiment or unit, service number, POW number, and the camp in which they are recorded as being housed. If you wish to know the details of any person write to me at firstname.lastname@example.org and I shall look them up. When writing, it is not essential but I'd be grateful if you could include the full name of the person you are seeking, the branch of the services they were in, and any of the details listed above which you already know so that it will aid me when cross-referencing against similar names.
British Service Records
Service Records do not contain a wealth of detailed information but they do establish the basic facts and dates of a serviceman's history and therefore they are an essential first step to any research. See https://www.gov.uk/requests-for-personal-data-and-service-records for more information.