Hi,
I've just acquired this off eBay:
ARMY CANVAS UNUSED RIFLE SLIP | eBay
As you can see, it looks like one of the WWII Lee-Enfield webbing carry cases, but it's olive green rather than khaki and 1984 dated. 'MW&S' is a British webbing manufacturer.
Any idea what was it made for? Cadet No.4's? No.8's?
Thanks,
Mark