Most interesting - I have an identical item to the object in your 3rd & 4th photos.....
Attachment 942103
Attachment 942104
The markings are '2.P.' with crossed pennants, 'W.D. 303' with Broad Arrow, '74E' beneath Kings Crown.
I bought it in a junk shop in the mid-1960s and have never researched it. The machining is of good quality and somehow I've always assumed that it's part of a Bren mechanism. If that is the case, I wonder if yours - with its very minor differences, could be from a Czech ZB26 ?
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