"The winter of (our) discontent." The 'our' is in Shakespeare's 'Richard III', whilst the general phrase described the political/union troubles of the late 70s.
Now is the winter of our discontent
made glorious summer by this sun of York
lines 1 and 2 of act 1 sc 1 of RichardIII.
sun is a pun for son
Yorkists used a sun for one of their emblems along with a rose because an important battle which they won was fought in snowstorm with the sun shining through giving a particular effect (perihelion)