The subject is a 8 "barrel" Smoke projector that can be seen in some 1945 pictures of Canadian Shermans, and also Wasp carriers.
I don't even know what the proper name is for this piece of kit....but after speaking with Tim and Hanno, we thought at least it deserves a thread of it's own to gather info and learn more about it.
According to a quote from a war diary posted by Steve Guthrie on another forum, the projector was developed by the RCEME.
Attached are some period pictures of Wasps showing the projector, as well as a Sherman Firefly Ic with the projector fitted to the mantlet.
1st picture; Wasps in Beilen 1945, source:
https://beeldbankwo2.nl
2nd and 3rd picture; Wasps in Zutphen 1945, source:
https://erfgoedcentrumzutphen.nl
4th picture: Wasp in Zwolle 1945; source:
https://historischcentrumoverijssel.nl/
5th picture; Sherman Ic; source:
https://www.canadiansoldiers.com/veh...hermantank.htm