Regarding the original rifle in this thread, the fact that Cowan's specifically mentions the gun is void of a British Firing Proof and most likely assembled from leftover parts could indeed answer as to why it isn't in the Parker-Hale books.
Very high estimate considering the scope isn't worth much. Dang! I'm saving up to buy a new truck as a retirement gift to myself next year and you guys keep tempting me with these interesting and collectible rifles. LOL! (Stay strong Sapper, stay strong!)