46indian,
I believe 384619 is a Lend Lease. The stock and trigger housing, maybe the entire trigger group, are replacements and the front sight seal is missing so it is not completely original unfortunately.
This serial number fits in the LL range and the condition of the metal seems to indicate little use which is typical of many LL rifles.

I do not think the location of the Britishicon proof marks has anything to do with Sam Cummings or LL identification. The location of the proofs so far back on the barrel and the neatly spaced and aligned application of them are rather uncommon.
Is the letter code in the left angle of the scepters an F, L or a K or something else?

Is there an 8 on the underside of the follower ? If so, is it on the end or in the middle?
Is the heat lot on the receiver's right front leg B 6 ?
Is the barrel date 10-41 or 11-41? I can't quite make it out .