Can anyone help with identifying?!!?!?!?

[MichiganGuy]

I have a .303 rifle that has been in my family for many years, however I have not been able to identify it on all of the websites I have visited. I have attached some photos, but the markings were too small for my camera to distinguish, so I will describe them: On the right side of the barrel, it is marked ENGLAND 303 2.22"
75410 75410
Z Z

On the left side of the barrel, directly under what I assume was/is a safety of some type, just above the trigger it is marked: Nc.1.MkIII or possibly MkII and just below that is marked FR43

I also tried to attach some pics, but the file size was too large so I will try again! Thanks!
Roy

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