The Home Office publishes data on visas in the‘Immigration Statistics Quarterly Release’.https://www.gov.uk/government/collections/immigration-statistics-quarterly-release
Data on grants of visas, by category, are published in table Vis_D02 of the entry clearance detailed datasets. https://www.gov.uk/government/statistical-data-sets/managed-migration-datasets#entry-clearance-visas-granted-outside-the-uk These data show that 512,749 visas have been issued in quarters 1 and 2 (January to June) 2020. Of these, 49,679 were for Work, 46,258 were for Study, and 15,426 were for Family reasons.
Information on how to use the dataset can be found in the ‘Notes’ page of the workbook. The latest data relates to year ending June 2020. Data relating to the third quarter of 2020 (July to September) are due for future publication, on 26 November 2020.
Additionally, the Home Office publishes a high-level overview of the data in the entry clearance summary tables. https://www.gov.uk/government/publications/immigration-statistics-year-ending-june-2020/list-of-tables#entry-clearance-visasThe ‘contents’ sheet contains an overview of all available data on entry clearance visas.
Information on future Home Office statistical release dates can be found in the ‘Research and statistics calendar’. https://www.gov.uk/search/research-and-statistics?keywords=immigration&content_store_document_type=upcoming_statistics&organisations%5B%5D=home-office&order=relevance