From Northern Ireland to Vietnam, the Falklands to Syria, the photographs taken by Don McCullin have come to define some of the most pivotal events of the past 70 years.

As he publishes Irreconcilable Truths, a definitive retrospective of his life and work, he will be joining us in conversation with Channel 4 News presenter Jon Snow to reveal the stories behind some of the most iconic images of the second half of the 21st century.