I actually feel fortunate that I do not own an H & H Royal in need of a stock replacement.
+1
SRH
The posters that are expressing reverse snobbery should be aware that it often comes off as plain old jealousy!
Personally, I wish I had a 16ga H&H Royal in the condition & configuration that justified restocking to my specifications by a top stockmaker.
If the gun was such that the expense of a complete restock was questionable I would give serious consideration to a butt transplant assuming the head of the stock was in good shape. I've seen several of these done that were virtually undetectable.