This one up for grabs.

[Bruce_in_Oz]

And that "Rifle, Intermediate" was the platform for the "Bayonet, Parachutist", commonly called the “Machete Bayonet”.

If you take a quick look at one of these beauties in isolation, and didn't know what it fitted, it looks like the designers stuffed up badly with the design, as the "muzzle ring" lines up very nicely with the top 1/2" or so of the blade height.

Once mounted on the SMLE-style nose-cap, with its "low-rider" bayonet boss and sword bar, on the "Intermediate" (or standard' rifle), it all makes sense.

The entire concept of the "intermediate" rifle and its bayonet is in the name of the bayonet: "Parachutist". These were conceived as a"package" to equip the rapidly growing airborne units that were to be used in the big pushes up through the islands of south-east Asia and if needed, an assault on Japan itself. The bayonet was more a "multi-tool": parachute-shroud cutter, entrenching tool, and jungle basher, than a serious "bayonet", though I imagine it would leave quite a mark if used for that purpose.