Following our discussions I had a poke around the Freestyle Libre.
I discovered that I could export data from the PC app to a spreadsheet.  The format is as you might expect – very obvious.
I also futzed around trying top read an old sensor (I read that you can break them somehow – seems unlikely, but…)  After a bit of fiddling around I finally managed to get the sensor to spit out something to my Android.   Now I need to figure out the format.  
I know from reading around that the fields contain:
  1. the time and date of reading,
  2. the time (and date?) the sensor was activated
  3. the reading #
  4. BG reading – probably in  mmol/l
  5. a flag indicating if it was a 15m scheduled sample, or a user initiated sample

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