In 1944, Roberts was recruited to the Foreign Office Research Department to work on the political problems of the
British Antarctic Territory, then known as the Falkland Islands Dependencies, and to co-manage with James Wordie and Neil Mackintosh the secret British Antarctic expedition
Operation Tabarin, which was renamed the Falkland Islands Dependencies Survey in 1945 and eventually became the
British Antarctic Survey in 1962. From 1946 to 1975, Roberts continued to work part-time at the UK
Foreign Office as its first Head of the Polar Regions Section, providing specialist knowledge on Antarctic history, politics, place naming and terminology, and initiating the post-war
Antarctic Place-Names Committee. Roberts had a major role in the conception and evolution of the Treaty and continued to do so once the Treaty became operational, representing the UK during the years 1961–1975 at the (then) biennial
Antarctic Treaty Consultative Meetings. Out of his concerns for nature conservation in the Antarctic he initiated the
Agreed Measures for the Conservation of Antarctic Fauna and Flora and the Convention on the Conservation of Antarctic Seals (1972). == Recognition ==