smart meter blue light constant beeping

Have you had a power outage, maybe in the recent storms?

A smart meter can sometimes lose communications following a power cut, and a flashing blue light can be a sign of that.
it will often resolve itself afer a few days, but does sometimes need an engineer visit.

See this similar question from 3-months ago, and the reply by Ben_OVO:

Hey ​@Markiebwales 

Sorry to hear about this, though I am glad to see that Nukecad has already stopped by with some helpful advice on this.

If you’ve not done so already, definitely check out the topic Nukecad linked to;

If it’s been a few days already, it’ll probably be worth getting in touch with the Support Team for help, or about a potential replacement if they feel that’s necessary.

Do let us know how you get on.