This thread?
https://www.milsurps.com/showthread.php?t=70374&page=1
Also, what I presume are the same slings on Gunbroker, not that that helps you chaps overseas from the US much:
WWII British Enfield T Sniper Experimental Sling - Other Rifle Accessories Parts at GunBroker.com : 862600652
and
WWII British Enfield T Sniper Experimental Sling (Battle Worn) - Other Rifle Accessories Parts at GunBroker.com : 868509218
Also swear I saw one supposed original for a few hundred on gunbroker awhile back.