OWD my reflections are based on my observations of the market in the Uk for English guns.

Perhaps you know better than I.

Unlike barrels, re-stocking is pretty irrelevant who did it as long as it is done right.

Many old guns were very short. Re-stocked to modern preference for around 15" and done correctly, the re-stock makes the gun more attractive. Or perhaps you prefer a gun with 13" of original wood and a 2" extension?