Thanks, Peter.

I will run the verniers over it next time i am visiting.

The butt still intrigues me; mainly the fact that it is visually identical to those seen on the classic No4 (T) C, but the profiling of the socket bit is definitely SMLE.

Never having pulled apart any of the "oddball" early No4 series / No1 Mk6 types, I do not have intimate knowledge of the socket variations of these.
Any thoughts?

tbonesmithicon: The tools are the usual screwdrivers, front-sight adjusters and a small hammer. Gauges I recognised were Striker protrusion ( 2 variants ), Headspace, (corrosion made reading the markings if any, impossible.), and the usual bore go and no-go gauges. There were, from memory, a bunch of assorted front-sight blades, ans a motley assortment of small screws in varying conditions.

The owner is a Lee Enfield collector and wants to keep them. (I did try, though).