I have one that also hasn't been through the Weedon "pick 'n pull" and the question yours reminds me of is: were these rifles that were sold before WWII, rifles from the general stock that somehow missed the trip to Weedon, or rifles from the 10,000 Winchester P14s purportedly put aside after WWI for possible future sniper conversion?
Bearing in mind that the purported laying away of all the Aldis scopes pulled off the SMLE snipers scrapped post-WWI never in fact happened, I suppose one shouldn't be too confident that the 10,000 Winchesters were put aside either, but it's all we got for info so far.