On Monday at the diabetes education session the nurse was adamant that the increase in BG levels was entirely coincidental, not due to statins at all. Must be some sort of collective delusion, either on the part of the people seeing it on their meters or the statin worshipers of the NHS.
I can only suggest that you complain about it to everyone involved.
The combination of statin and Metformin I took for just over a month before Christmas has definitely affected my mental abilities, so I stopped taking them. Hopefully if anything happens it will kill me - I'd prefer to stop living than to exist as someone who used to be me.