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Depending on whether their father Joseph Chamberlain manages to become Prime Minister himself (via some a few pre-1900 PODs) from around the late-1890s to early-1900s, the challenge is to lay the groundwork for a rivalry between Austen (who possibly merits living another year or few) and Neville either one of whom leads the Conservative or resurgent Liberals.
The Pro–Rearmament vs Pro-Appeasement stances taken by the half-brothers in OTL can be either used as the main focus or be but one facet of the pre-war rivalry between them.