Thank you Roger. It makes sense that the "careful restocking" work done by H&H was simply fine tuning, etc., as referenced by Skennertonin "The Lee-Enfield" and "The British
Sniper". In "An Armorer's Perspective", by Laidler
and Skennerton it is more clearly defined: "the rifles were stripped and the rifle number stamped into the woodwork". Clearly if they refused rifles with solid foresight blocks they were not going to re-stock them as well!
As a follow up, what about the wood of late war cheek rests? Most look pretty dark, suggesting walnut but I suspect they were made by whatever small blocks of wood were at hand.
The flecks in the grain of Beech seem the best way to identify some dark wood stocks of undefined species.