Government Test Alert @ 3pm Today

I hope this doesn't go off on folks' phones out on holiday on some Spanish beach!!!

I never got one I'm using GiffGaff which is on the O2 network and I turned off extreme and severe alerts when I got my phone. Unless the government make it compulsory for the alerts to be sent then I think most people will just turn off the alert notifications in their settings.
It's easy to do just go into the settings, then tap notifications and scroll to the bottom and turn off the two items listed as extreme and severe notifications.