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Then there is this appliance: Repro, Bolt Head Wrench for SMLE, Rifles No1 and No2

Presumably the BW were working with a stock of new bolt heads? As your study of them showed, the used examples can vary so widely markings could not be relied on.

Tolerances are of course...

The 16° and L42A1 comment was Peter's statement quoted by you elsewhere, and I therefore took it as the last word. ;)

Correction to my last: 16° max for run of the mill No.4s and as few degrees as possible for the L42A1. ;)

Do we have a consensus on the acceptable limits of over-turn? IIRC 12° was mentioned by Peter in connection with the L42A1?

When I mentally compare the interfaces of the female threads in the...