A new travel system for visitors to the UK comes into force from Wednesday for citizens of dozens of countries like the US and Australia.
The government says electronic travel authorisation (ETA) will improve the immigration system.
However, it has created problems for dual nationals, who have been scrambling to get a UK passport to follow the new rules.
An ETA is a digital permission to travel to the UK.
From 25 February, most people who have been able to travel to the UK visa-free until now will need an ETA.
