A. Johnson, A British Pow, Identified On A Japan 50 Sen Banknote, Who Survived The Ordeal.

This note was in a junk bin at my LCS.

The banknote is a Japan 50 sen banknote, Pick #58, dated 1938, mundane and nearly worthless.

However, I have transcribed the writing:
(front) l/SGT A. Johnson
17 Park Crescent
Romford, Essex, England
(back) (signature) A. Johnson
Liberated P. O. W.
From Osaka, Japan
Captured 26/12/41
Released 8/9/45

Note:
Allies Surrendered to Japan in Hong Kong on 25 December 1941. Per Wikipedia, there were 5072 British Prisoners among the about 11,000 captives.

I was wondering if I could find out anything about Mr. A. Johnson, such as his age and how long he lived after his release.

Unfortunately, A. Johnson doesn't narrow it down much in the entire UK population, but there can't have been many men named A. Johnson in those 5000 who survived the camps.

I found links to various online war records, but some of them have a paywall, and the rest gave no useful information. I'm not sure the significance of l/SGT. Are there different types of sergeant?

17 Park Crescent seems to be a nice house and in a nice location, from Google.

Perhaps someone has access to or knows more ways to search for information.