If you have a hearing impairment then you have the right to ask for communication support. If you lipread, you could ask for a lipspeaker to be booked for your appointments - they are professional interpreters who have been trained to lipspeaker clearly so you can lipread them (some will also use sign language or sse (sign supported English) if required). All medical settings can and have to provide this if required (but be aware it may delay your appointment due to having to book an interpreter). The interpreter may be there in person or in a video call.
The other option, if it's more of a milder-moderate hearing loss is to use live transcribe on your phone. It's not perfect but it can work quite well. Also means you don't have another stranger in an appointment that can be difficult enough as it is. Just explain you have a hearing loss and you use live transcribe to give you captions to help you understand what is being said.
It's all very well people saying that you should just be able to manage but with hearing loss, even just a mild one, understanding people that you don't know is much harder. Understanding someone with an accent - that is any accent (whether one of the many UK accents or foreign accents) is even harder because you have to learn how the accent affects the way words are said. If it's a foreign accent, even if its someone who has a good command of their 2nd+ language, there can sometimes be word or phrase differences as well and this adds an added difficulty.
I'm profoundly deaf and have a cochlear implant. If it's (for example) a doctor I don't know, I explain that I am deaf, that I can't always understand/lipread someone I don't know due to clarity, accent, frequency or even loudness of voice and request an interpreter. At my GP surgery, I request one particular GP because I know I can lipread her and this helps avoid having to go through the process of getting an interpreter booked.
The point is, you have a right to be able to understand the medical professional you are speaking to and if you need support due to hearing loss, you are eligible.