1940 Lithgow SMLE No 1 Mk3 JJ Import Bitster Yes or No?

[Homer]

Yep it's not likely to be original 1940/41 forend unless the vertical reinforcing pins were fitted later as 5th said. I've noted 1941 dated actions serial numbered up to B85000 without the pins present if that helps.
Honestly with respect HOH your going to have to do way better with your photos if you want any sort of an accurate appraisal. You'll need a butt broadside, action, barrel, bolt, rear sight, forend and nosecap as close up and clear as possible.
The action looks like it may have been parkerised so probably a refurbished rifle with a mix of parts if that's the case. An unnumbered nosecap could indicate a 45/46/47 refurb as would an unnumbered forend and barrel. Butt would be stamped to indicate this but it's only speculation without better photos and more information.