I asked because I have a couple of recently made 1907 pattern slings for my No4Mk1 rifles.
They seem a bit short; on the very last hole of the front strap and would be better with an extra few inches.
I'm currently seeing if I can get some longer ones made in the UKicon; so I can also use one on the No1MkIII*as well. Being slightly longer to the front sling mount.