The text was just one way of being told. I got one today. From what I understand there are several ways of identifying patients, eg outpatient lists, medication lists, GP records of diagnosis or prescriptions.
So some people might get 2 letters and a text, some just a letter or a text. And if you think you are missed off the list you can ask to discuss with GP.
I'm paraphrasing the deputy CMO from yesterday's briefing.