Before you come in
General guidance for any specialist appointment is to bring your referral letter if you were given a copy, any imaging done elsewhere, and a written list of the medicines you take — including anything bought without a prescription. Writing the list down beforehand rather than relying on memory is the usual advice.
If you need an interpreter, ask when the appointment is made rather than on the day, because arranging one takes time. You are also welcome to bring a support person.
A real practice would confirm its own requirements here, and they may differ from the general guidance above. This is a fictional practice, so there is nothing to confirm against.