William G. (Bill) Hillman runs a large military tributes site and is the Webmaster of the Commonwealth Air Training Plan Museum and the related "Official Publication of the RCAF Ex-Air Gunners": Short Bursts edited by John Moyles from March 1983 through December 2007.

To tie 2 threads together, here are several contributions from Bob Henderson:

• June 2006 - WOG Wing (unofficial insignia?)
• May 2006 - 1940 Spotter’s Log
• June 2005 - short roll of WW2 currency
• Mar. 2005 - plane crash at Stalag 1VB
• Nov. 2004 - Sweetheart Pins, Japanese Balloon Bomb
• Sep. 2004 - Canadian POW Sgt. W. M. Vanzant
• June 2004 - RAF squadron shot down Dec. 1942
• May 2004 - an unidentified pin
• Feb. 2004 - model ships built by German POWs
• Oct. 2003 - model biplanes built by WWI British POW
• July 2003 - Penny match covers (*)
• Nov. 2002 - 1946 article on Japanese Balloon Bombs
• Sep. 2002 - "Lagergeld" (POW camp money)

(*) An amusing note:

If you have trouble turning your monitor upside down to read the topside of the match cover, just stand your grand child on his or her head.

Bob Henderson also co-authored a book in 1993: German Prisoners of War in Canada and Their Artifacts, 1940-1948

by Robert J. Henderson and C.M.V. Madsen
ISBN 0-9697888-0-0
SOFT COVER,  6" X 9",  203 pages

Details from AirMuseum.ca:

The definitive book on the history, activities and collectable artifacts of German Prisoners of War (with some Veteran Guard of Canada) ... from the Second World War.

Documented details including photographs, locations of branch camps, Labor Projcts, Military Hospitals, and Detention Centers. The book includes a special section on the collecting of artifacts relating to these Prisoners, including eighty photographs of "Collectibles" currently held in the Homefront Archives & Museum at Regina, Saskatchewan.

The book provides the historian, the researcher, and the colletor with details not found in any other publication!

There's a listing at Amazon but no copies available there or via AbeBooks.

Chris Madsen is also the author of another book on the period: The Royal Navy and German Naval Disarmament 1942-1947.

Robert J. (Bob) Henderson turned his collection of artifacts into the "Homefront Archives & Museum".

AirMuseum.ca has some background:

Bob’s interest in German PoWs began when he was 12. His parents told him stories of prisoners escaping in Northern Ontario, where he lived at the time. In 1985 he traded with a friend for a carving made by a PoW.

“I thought, ‘Well this is an area of Canadian history that is completely ignored and unknown. If everything is as nice as this carving, I’m going to start collecting it’.”

The most treasured piece in his collection is a PoW’s painting of a soldier walking with his machine gun on his shoulder. The 250 cm. X 120 cm. Painting is done in shades of brown and cream.

...

In SEPT 1996, Mr. George HOEGAL of Munchen, Germany, wrote to identify himself as the artist who had painted the picture.

Follow the link to read more.

Bob has graciously sent me some additional material on one of Klaus Conrad's escapes, which I will post to the blog at some point.