Britain's King Charles and his sons William and Harry will walk behind the Queen's coffin when she leaves Buckingham Palace for the last time later today.
Thousands are expected to line the streets to watch the procession to Westminster Hall, where the Queen will lie in state until Monday.
Overnight thousands of people began queuing for a chance to file past her casket so they can pay their respects.
Lines of people are expected to stretch for four-and-a-half miles through the capital.
Historian and author Anthony Seldon says the crowds are like nothing seen in generations.
