Sadly the government lost my trust to use the capability responsibly, I've opted out of future messages. https://www.gov.uk/alerts/opting-out

Just did the same for the 'severe' alerts (you can do it in the iPhone notification settings). I thought I might be overreacting but after reading a few threads 90% of people's first thought was "nuclear attack". Using serious tools in stupid ways is only going to cause more problems.