Pickman's model
Starry Wisdom
there is only one case of which i'm aware of anyone being 'strung up' for manslaughter: that of one thomas cooper in 1816: http://www.oldbaileyonline.org/browse.jsp?id=t18160214-19-off112&div=t18160214-19#highlighta cop strung up for manslaughter.
there'd clearly have to be major changes in the legal system before mr harwood faced the gallows.