Thanks for the help to date.
Bolt handle appears to be silver soldered on plus the screw. Apparently it has a very large unusual bedding lug. The cocking shroud/piece seem to be the most different aspect to an Omark bolt. The action displays machining marks and is also as hard as hell.
The rifle belongs to a mate. I will attempt to get some more photos with it removed from the stock. I did tell him that I knew of an excellent forum where I was guaranteed to get an accurate identification.
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