Thank you everyone for all the helpful comments. I'm not about to disconnect and give up at the 1st hurdle - I'm pretty pig headed and like to understand things. A bit frustrating as I was hoping to get to a couple of finger pricks but with the weird readings I've ended up having to check more than I intended.
Blood - Wait - Scan
After I bit of experimenting it seems 6 mins gets me reasonably close to the finger reading - as in 0.1 close. Will watch this tomorrow and see if I get the same results. The sensor is fine. Still very secure and living under Opsite. I skipped aqua today as I had Grandson but will be in the pool Friday and Saturday. Hopefully it will remain firmly attached.
Since I activated it this afternoon I've been in the 6's all day but one thing I have noticed now having checked the BG log against the Libre is they were moving in the same direction it just the Libre was well out at certain points I.e the 4.1 but I had dropped to 6.1 and an 8.2 that was actually 6.8. I just put a note on the readings on the Libre to say they were well out.
@Bluetit1802 I can't see anything about 15 min logs on the app.
@Brunneria uses the App too so maybe she can add to this?
Both grandsons have now spotted the sensor now and are referring to it as Nana's secret sugar thing!
The other thing Nana's secret sugar thing told me today was that post dinner my BG did not go up - it fell and went on dropping. Not as low as the Libre thought but it was falling. All in all its been a pretty good day and it's nice to know I'm not harpooned by that needle