
The Foreign, Commonwealth and Development Office (FCDO) has flagged 55 countries and regions with do-not-travel warnings due to heightened security risks, potentially voiding insurance for UK travellers if advisories are ignored. As of 24 December 2025, the FCDO advises against all travel to 11 entire countries and parts of 44 others, citing threats like armed conflict, terrorism, political instability and other hazards.
This guidance assists British nationals in assessing dangers that could severely impact their safety, insurance cover and access to consular support.