His last known radio appearance in the United States before returning to Britain to help with the war effort was the "Radio Tribute to the King and Queen" in which dozens of British stars performed skits while King George VI and Queen Elizabeth listened with President Roosevelt and Mrs. Roosevelt from Hyde Park. Howard's appearances on the BBC's "Britain Speaks" were broadcast to the United States from 16 July 1940, after the onset of the Second World War urging America to enter the war in support of Britain. By January 1941 Howard had completed 27 broadcasts of "Britain Speaks". Howard also appeared on a panel programme for the BBC called "The Brains Trust".