Too bad the stock has been "restored", but appears to be an interesting transitional piece from the MkII to MkIII.

Except for the aperture screwed onto the leaf, the sight appears to be a standard MkIII pattern, and does not look hand-made, so that is probably a later addition.

The charger bridge may be a replacement since the wear marks shown under the left hand edge cannot have been made by that bridge. Perhaps a Lyman No.50 sight was originally fitted that later went missing, or a different charger bridge.

The "H5" is probably for "Hughes" as Sir Charles was ever canny in seeking official approval; witness the many presentation rifle he sent to prominent officers and politicians.

The swell of the buttplate at the heel is much more pronounced than a Lee Enfield butt plate, and the tab on the butt-trap cover looks longer, the tang looks quite different too.

Have seen a trigger guard like that on some other rifle, but can't place it now.