Activities remain subject to the visitor rules; neither permission should be understood as a general right to work or undertake extended study. Certain meetings, conferences and short study activities may be permitted if their specific conditions are met. Taking employment in the UK or following a longer course may require another category. The substance of the activity matters more than its label. An invitation describing a business meeting does not automatically make day-to-day work permissible. Check the relevant GOV.UK activity and course requirements before selecting a route or preparing the supporting evidence.