Another possibility would be a search of POW records.
These used to be held by each nation, but have now been consolidated by the Red Cross. Your friend should be able to request a search if proof of relationship can be established to the satisfaction of the Red Cross.
Information can be found on the web site of the International Committee of the Red Cross under their Archives Division and Research Services.
If he was a prisoner of the British Army, might also be worth checking the National Archives in London. Copies of the POW files might have been retained there as well as being forwarded to the Red Cross.
David
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