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Many Thanks for all of the input, its been a long day and fatigue hits in, besides every day is a learning curve,.....and i do get some of these right, ..........👍

Edward VIII didn't have any coins OFFICIALLY issued, but the new brass 3d was issued to traders for them to try them out in slot machines. They were supposed to be returned but a few weerent so these are extremely rare and valuable. Also, there are rare proofs of many (all?) denominations, so it could be argued you can exclude him from the list. As for Lady Jane Grey, she is not included in many lists of official English monarchs - Edward VI had tried to disavow Mary and Elizabeth and nominated Jane as the nearest Protestant candidate. Even if you do allow her, 9 days was hardly enough time to prepare and issue coins!.

Probably insufficiently annealed. Stress cracks happen quite often and I tend to ignore them if not too obtrusive, or the coin is rare enough to override them.