I've an interesting observation on this sensor. As I've mentioned, it has been running quite a long way from good, however, I was suspicious that this might be due to a reaction. Over the last couple of days, I've been taking anti-histamines for hay fever, and have discovered that during the 5-7 hours post taking them, the sensor accuracy realigns with that of the fingerprick tests. They then seem to go their separate ways.
So for me, at least, it seems that the sensor reaction is ameliorated by the use of Anti-Histamines. I'm looking forward (sort of) to getting the replacement and taking this one off to see what remains of my arm underneath...