As an update I called Abbott first thing this morning and went through everything, giving them example readings showing the difference. There was no issue in sending out a replacement sensor, but of course there is a 5 to 7 working day lead time for this. All the customer service person said...
Quick update - just tested my wife (who is non diabetic) using the Contour Next BG meter and get 4.9 which would be right for her. So I think I can rule out the BG meter being wrong, which leaves the question as to why the Libre is so much lower today.
I am only on day 5 of using the Libre 2 and up to now I have been really impressed and feel it is a game changer. Much more information and love being able to see trends, etc.
However - today the sensor readings have been really low, I’m getting lots around 3.3 to 3.9 when I don’t feel low...