It's interesting what turns up. Not too long ago I got the book, "In Search of Pegasus, The Canadian Airborne Experience 1942-1999". It has a lot of good photos, incl one on page 73 of four troopers armed with a PIAT, a STEN, a BREN, and what is clearly a No5 JC! AFAIK the No5 was never adopted by the Cdn Army and I wondered if this might have been an experimental/prototype Longbranch model. The photo has a DND credit and is captioned, "Four paratroopers at Stevenson Field Ipperwash, Ontario during a rehersal for an RCAF airshow, July 1946". One thing that made me wonder was the identification of "Stevenson Field" at Ipperwash as this was the historic name for the RCAF airfield at Winnipeg, MB.
On a somewhat related topic I recently confirmed that a vertical laminate No4 stock and 2 matching handguards, which I have had for a number of yrs, are actually Longbranch production. These were owned by a known Bisley shooter and the forend has been center bedded. I always assumed that they were made by Fazakerly because of a large "F" stamped on the forestock. I cleaned them up and found the distinctive Cdn "CCM" stamp on the metal forend tip as well as a 3 digit number stamped inside both the front and rear handguards.