From 25 February, a new system will come into force which will affect many people, including British dual nationals.
Once approved, your ETA will allow you to stay in the UK for up to six months. It will be valid for two years, or until your passport expires, and allows multiple journeys to the UK.
— Source: BBC News (https://www.bbc.com/news/articles/cy57p1v61d1o)
