When the banned Polish trade union organisation, Solidarity, was legalised in April 1989 it was one of the first signs that communism was about to collapse in Eastern Europe. Within months Solidarity was leading a coalition government in Poland and soon afterwards the Berlin Wall fell. In 2015 Tom Esslemont spoke to the former Solidarity spokesman Janusz Onyszkiewicz about the events of that historic year.
This programme is a rebroadcast.
Image: Lech Walesa, pictured in March 1989 (Credit: Marc Deville/Gamma-Rapho via Getty Images)