The govt. is planning some emergency alert system tests, which are gunna make your phone make a sudden loud siren noise! Times for when they will occur and other info is here:  [https://www.gov.uk/alerts/planned-tests](https://www.gov.uk/alerts/planned-tests) and a way to opt out if you need to (for both android and iphone) is here:  [https://www.gov.uk/alerts/opt-out#mobile-network-tests](https://www.gov.uk/alerts/opt-out#mobile-network-tests) 

Hope you're all okay!