If it’s the libre 2+ it lasts 15 days rather than 14. It will tell you it’s going to end, and then stop. They can take a little while to bed in, but even then for me they read around 0.5 to 1 lower than blood testing at low levels, and the same amount higher at high at levels. But it’s still a really good indicator of trends, and good for testing tge impact of different meals,
If you chose to fund them you can get them vat free….if you buy from abbot there is a box to tick to say you are entitled and just a little info to complete.
Dexcom usually have a free trial as well.