Congrats on the reunification. Interesting that Kershaw would be brought on line to manufacture the Mk.I scope as late as 1943.

Was one of the previous makers bombed out (W.Watson?), reassigned, or simply not up to snuff?

Tends to beg the question of why Mk.3 production was reassigned to Kershaw, Cooke, Troughton & Simms and Taylor Hobson & Co. when Houghton Butcher Mfg. , Kodak Ltd., and William Watson & Sons had already gone through the extensive process of setting up assembly lines, testing and inspection facilities, training workers etc.?

On the face of it that sort of change would make little sense from a speed of production perspective.