Following on from "One to One", Martin and I spend this week and next discussing the politics of Paul (and Linda) McCartney.     This week, the Beatle years.    How Paul brought John into the peace movement (and possibly why he deserves that credit on "Give Peace a Chance"), McCartney and Bertrand Russell, Blackbird, Commonwealth and on through the early solo years.    Next week, a rundown on solo McCartney's political songs! #madeonzencastr