The son and daughter of former British Prime Minister Margaret Thatcher have arrived at Westminster for a special service.
London will stage its biggest political funeral in years today, when the Queen and other dignitaries bid farewell to Thatcher.
The bells of Big Ben will fall silent for the first time since Churchill's funeral.
More than 700 men and women from Britain's armed forces will honor the late Prime Minister.
Thatcher died last week after suffering a stroke.
She was 87.