Wow, great info - thanks everyone.
This started for me about a month ago with the photo of the Governor General Foot Guards Sherman Firefly in Germany 45 and the obvious "what's that on the Mantlet" question.
Digging on the Canadian Military Model Maker's forum on Facebook led to the info from Steve Guthrie and I have since found relevant pages in the 4th Canadian Armoured Brigade war diary for the demo to units.
In addition to the war diary data, I have found some other photos of GGFG Sherman with this mounted on the Mantlet which I will find and post.
Also, I am advised that the Ferret Armoured Car had a 66mm Launcher which used the F013 electric fuse (very similar to the No 14 electric fuse) which also launched the no80 smoke grenade.
Tim