Brits are being urged to prepare for 'one of the biggest public safety exercises' in UK history as ministers oversee a fresh test of the country's emergency alert system.
At around 3pm on Sunday 7 September, millions of phones will vibrate and make a siren sound for around 10 seconds as Brits receive a text of fewer than 100 words.
It will assure the public that they 'do not need to take any action' and include a message in both English and Welsh.
The Government has previously used the emergency alert system for real on five occasions, including in January to warn people in Scotland and Northern Ireland about Storm Eowyn.
Approximately 3.5 million people across Wales and south-west England received an alert during Storm Darragh last December.
