Scotland, Wales and Northern Ireland. It identifies the capital cities - London, Edinburgh, Cardiff and Belfast - and also the flag and a key human and physical feature of each country.

A social media post about Northern Ireland which used an Irish tricolour has been removed by 10 Downing Street. An edited version of the Instagram post has now been uploaded without the flag.

Millions of people in Ireland and northern parts of the U.K. are being urged to stay at home as hurricane-force winds disabled power networks.