An algorithm for including subleading colour corrections in a parton shower has been reimplemented and extended to include parton-parton events in Herwig. With this Herwigs dipole shower can now correct any number of emissions for subleading colour and then continue showering using the leading colour approximation. The most obvious use of this is for studying observables sensitive to these corrections, for example gap cross sections at hadron colliders, and to find new observables where this effect is important. Another use of the corrections is in improving NLO matching and merging. As the subleading Nc terms are kept, the soft singularities of the matrix element calculations will match the soft singularities of the parton shower.