Dual nationals to be denied entry to UK from 25 February unless they have British passport

Visitors to the UK will soon have to pay £16 for a six-month Electronic Travel Authorisation as well. Photograph: Alex Hare/Alamy

Dual British nationals have been warned they may be denied boarding a flight, ferry or train to the UK after 25 February unless they carry a valid British passport.

The warning by the Home Office comes amid scores of complaints from British people living or travelling abroad who have suddenly found themselves at risk of not being allowed into the UK.