National Emergency Alerts

I think we are being prepared for a war, unlike most of Eastern European countries we don’t have bomb shelters and air raid sirens. 
they will need to inform us to take cover at some point. And this has got to be the easiest way to contact everybody quickly.

I think we are being prepared for a war, unlike most of Eastern European countries we don’t have bomb shelters and air raid sirens. 
they will need to inform us to take cover at some point. And this has got to be the easiest way to contact everybody quickly.

@ OP: They have been waging psychological warfare on the public for years, people who are scared are easy to control.

@ OP & Neil
Also I wouldn't trust a text alert to get to me in time to warn me about an atomic bomb anyway, the signal in the UK is tripe, easier just to rely on the old duck and cover and hope you are far enough away from the epicenter for all the help this governemet will be in helping protect us, especially because if a nuclear device were set off in the atmosphere everything tech underneath it without strong EMP shielding will go dark, your phones, computers, and even some peopl'es cars will just stop working. Arguably potentially all cars, but the battery in the car itself is theoretcally tougher and can survive weaker EMP pulses better than microchips.
But really any enemy likely to bomb the UK are more likely to wage that tech warfare rather than use such a device to cause death of civilians because it's not like the government would give a monkeys if taxpayers died anyway, as long as the champane in their own bunkers doesn't run out. Also killing people who could otherwise work for you in a take-over would be a shot in their own foot.
So in a round-about kind of way it's not worth worrying about it. Just don't buy any new cars that rely on a computer to tell them it's okay to start the engine, and be prepared to evacuate to a remote rural location of 0 millitary interest if you ever have to cross that bridge.
I always just prepare for the worst and then put it out of my mind until it does, "it might never happen" anyway but in the mean time the stress will certainly kill you if you let it.

I think it is in case of wild fires or floods.

I hope they will be more specific than early evening though, as we could be on high alert for a long time waiting. As it is a practise I see no point being vague about the time.