Starting February 25, 2026, new UK border rules will require all travellers to obtain an Electronic Travel Authorization (ETA) before entering the country. Approximately 1.2 million British nationals who also hold dual citizenship will be affected by this change, as they previously could enter the UK using only their non-British passports without any additional costs. Under the new system, dual nationals must either possess a valid British passport or a certificate of entitlement to meet the travel requirements.

The introduction of the ETA system will affect how dual nationals approach international travel. The cost of obtaining a British passport can be as high as £589, which presents a significant financial burden for those who may have relied on their foreign documents to enter the UK without charge. While these dual nationals are exempt from the £16 ETA fee, those attempting to travel with only their foreign passports may face delays or even refusal of boarding by airlines and carriers that are mandated to verify the travel credentials of passengers.

This regulatory change reflects the UK's ongoing efforts to tighten border control post-Brexit and ensure that all travelers are accurately documented before arriving. As the deadline approaches, dual nationals must assess their travel plans and preparation to ensure they comply with the new requirements to avoid disruptions in their travel activities.