I have written an email to the practice manager (who is the one who sent the letter) - posting it here (without names) before sending it in case anyone can spot any factual errors:
Dear _____,
I have received your letter of 3 December. (R) tried to call the surgery yesterday about this but did not receive a call back.
I have type 1 diabetes, so my diabetes is supervised by the hospital specialists and my diabetes medication was prescribed by a hospital diabetes consultant. Not having this medication would result in my death, so the surgery's renewal of all of this medication is normally automatic.
My other medication was all prescribed by a GP, and (with the exception of the Lactulose, which was intended to be temporary and which I no longer need) is all essential to preserving my already minimal health levels.
I should be grateful if you would ask my current GP, Dr _____, to review and renew all my medication (other than the Lactulose). She is welcome to contact me by email to discuss this, or to talk to (R) on the phone, but he'd need to know what day/time to expect a phonecall so he could make sure his phone was able to receive a signal.
As I have already informed you, I am shielding, so I am not able to make an appointment to come into the surgery at the moment. I am not being difficult or uncooperative. I have Myalgic Encephalomyelitis, which adversely and unpredictably effects the immune system. If I were to catch a serious virus, it could take me months or years to recover, or I might never recover and have to spend the rest of my life in bed. This means that until the pandemic is over I am not willing to take the risk of coming into the surgery for tests which are a matter of routine.
I do have my own blood pressure monitor and am able to monitor my own blood pressure. I also have a Libre and am able to monitor my own blood sugar levels, including 90-day averages and time in target. I am reliably informed (by another member of the Diabetes UK forum) that it would be possible for you to send me an HbA1c testing kit so I could if necessary check my own HbA1c.
I hope that your letter was an administrative error, as I was under the impression that you were already aware of all of this. I should be grateful if you would not send me any more letters or emails asking me to come into the surgery until after the pandemic is over, as I found it very stressful to receive another letter on the same subject. Myalgic Encephalomyelitis is worsened by stress, so stress makes me ill, and I am now very ill. Among other symptoms I am struggling to chew or swallow food, which is dangerous because I need to balance my food against my insulin. Ironically stress also causes my blood sugar and blood pressure (which normally tend to be on the low side) to spike, and they are both high at the moment.
I do hope this can be sorted out quickly, and all my essential and in many cases life-preserving medications renewed.