Alistair Petrie and Colin Buchanan both appeared in Dalziel And Pascoe s4e2 (Recalled To Life) but did no scenes together as Petrie's role was set in 1963, 35 years before Buchanan's scenes.
Holly Grainger and Colin Buchanan also appeared in Dalziel And Pascoe s6e1 (Walls Of Silence).
Colin Buchanan and Kate Gartside both appeared in Dalziel And Pascoe Truth And Consequences s6e4.