My relative with severe B12 deficiency and neurological symptoms has had a frustrating and stressful battle for months to get the more frequent B12 injections she needs and has just been asked by a GP in her surgery to fill in a form to accept responsibility for injecting more frequently.
We had already asked a GP friend some time ago why they were so reluctant to prescribe injections, and were told it was not allowed as they were afraid of being sued. It seems to confirm that being sued is their biggest fear - years ago, my own GP prescribed the extra thyroxine I needed to become well only when told I would accept responsibility for taking it.
Could it be that offering to accept personal responsibility is the key to getting adequate treatment until more GPs are willing to read and abide by latest research/guidelines and accept it is impossible to overdose.