City of London's Common Cryer reads royal proclamation for new parliament

The transcript is a royal proclamation announcing the calling of a new parliament. It outlines the desire to meet with the people and seek their advice in Parliament. The proclamation specifies the date and location for the new parliament session and concludes with a formal announcement from Buckingham Palace, dated November 6, 2019, during the 68th year of Queen Elizabeth II's reign.

What date was the proclamation given at Buckingham Palace?

What does 'Elizabeth R.' signify in the context of the proclamation?