  Spin correlations are an important, but often neglected, effect in modern
Monte Carlo event generators. We show that they can be fully incorporated in
Herwig 7 using the algorithm originally proposed by Collins and Knowles in all
stages of the event generation process and between the different stages of the
event generation. In this paper we present the final missing ingredient,
correlations in both the angular-ordered and dipole shower algorithms and
between the parton shower and hard production and decay processes.
