Found some more information...

"Authenticizing Your Enfield

Enfield Accessories

Most Enfields were originally issued with some or all of the following accessories: socket bayonet, sling, snapcap, muzzle tompion, and combination tool. Some of these are readily available today and add a great deal to an authentic Enfield impression....

...The really advanced Enfield fan may wish to add a combination tool. In the British Army combination tools were issued in two types: one for sergeants and corporals, complete with a built-in spring vise, and a less complicated model for privates. There were different styles for each type, some Y-shaped ("triarm") and others T-shaped..... Parker-Hale once made a reproduction sergeant's Y-tool, and some other company has made an excellent sergeant's T-tool, but these are hard to find now, and originals can sometimes be found among antique tools, for much less. There is also currently a reproduction T-tool that leaves much to be desired ... the best choice on a reproduction is to know what you're looking for. The best-made repros are coming out of England now (one example I have seen was a private's Y-tool)."

I sent an email to the Royal Armoury at Leeds, they have helped me in the past. At least they would know the official British way to carry it.

David