OK, so after stewing for a while I've composed the following response. Any thoughts/advice?
Thank you for your letter acknowledging my change of name and advising me to write to the Health Authority so that they can update their records. I have now written to them as advised.
However, I regret I feel it necessary to point out that it is not appropriate to address one of your patients by the wrong name and gender, particularly if that patient is on your records as being transgender. Perhaps you were unaware of my status when you wrote the letter? For a transgender person, being addressed by the wrong name and gendered title is deeply distressing and detrimental to our wellbeing.
My transgender status has been a matter of record at your surgery since June last year, so that coupled with the name change form I completed - as well as the Deed Poll I showed to your Receptionist when I filled out the form - should be sufficient for the Practice's staff to at the very least address me appropriately in correspondence.
Your letter suggests my details have not been changed on your system, which makes me worried about what may occur if I need to see my GP or obtain a repeat prescription for any of my medication. Will I be able to book an appointment in the correct name? Will the correct name appear on the board in the waiting room to call me for my appointment? I trust I will not have to humiliate myself in front of your staff and other patients by responding to a female name that I am no longer legally entitled to use; nor should I have to answer to that name when collecting my prescription from a Pharmacist. I would be grateful if a solution could be found.
I am aware that you have several transgender patients at your Practice, and you will no doubt have more in the future. I hope that this letter will be taken to heart so that your transgender patients can be addressed courteously and respectfully, as per your Practice's Mutual Respect Policy.