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If the UK had entered the Vietnam War after the Labour victory of 1964 could popular culture provide a strong anti-war voice in much the same vein as the Smothers Brothers:
For example IOTL the 1970's Dr Who stories had a political twinge. Could the Troughton/Pertwee/Baker 1 period have a similar effect on UK opinion?
(NB there was a YT channel called Troughton Lover which contained an excellent documentary called "When Worlds Collide" but it has been taken down which is a real shame)