Vaccination sites have no control over which vaccine is delivered to them. At present, there is no patient choice of which vaccination they will receive unless there is a clear clinical reason e.g. the AZ is licensed for those aged over 18, whereas the Pfizer is licensed for 16 years and above. Also if the patient has a significant vaccine allergy they are recommended to receive the AZ vaccine.
Our advice to you is to get vaccinated as soon as possible. Please do not call the surgery about the choice of vaccine. The vaccinator on the day will be able to guide you. Thank you for your patience and understanding.