Dual citizens of the UK and another country have been handed a lifeline that could allow them travel to Britain without either of the officially required documents. From next Wednesday, 25 February 2026, the electronic travel authorisation (ETA) will be mandatory for all travellers arriving in the United Kingdom – except British and Irish citizens. UK citizens are not allowed to apply for an ETA. Until now, the government has insisted that only a valid British passport or a “Certificate of