Helmore's contribution, to Britain's war effort was not confined to scientific research. He had earlier broadcast such events as the Schneider Trophy air races and reviews, and during the war his accounts of the RAF's work were heard frequently. His most notable commentary was when he broadcast an eye-witness account of the D-Day landings in Normandy, the first 'live', (recorded live onto transcription disc for transmission later), broadcast from over the invasion fleet on 6 June 1944, reporting overhead from an RAF Mitchell bomber.