I use the Freestyle Libre whilst on and off duty. As it measures interstitial and not capillary, the CAA as well as the DVLA do not accept it.
Blood testing via traditional finger prick still has to be carried out.
When I met with the diabetic specialist at the CAA, he knew from my consultant's report that I used the Libre and encouraged it's use. I also use an insulin pump - my control on pens were good but my NHS team decided to offer me the pump due to my occupation. It's great.
The A1c calculation on the Libre is very much a rough guide. It estimated mine to be approx 6.9%. When I got my bloods done, I was 5.9%. Certainly keeps you in the ball park however.
I fly purple aircraft for a well known regional airline and was swimming in the hold pool for the UK flag carrier before I was diagnosed. I told them straight away and they were more than happy to still offer me a position with them provided I could get my medical back - I start with the in the new year and that's with me having Type 1. Don't let diabetes totally rule anything out!