Liverpool Street Walk-in Centre

There used to be a time that you could go and see a Doctor. In fact often the Doctor would come and see you. It seems that nowadays you are more likely to win the lottery, than get a Doctors appointment.
So the NHS in their divine wisdom choose to create Walk-​in centres. No appointment, you just show up and wait your turn. And, you’d better hope they are not busy.
I do not go to the Doctors very often and have not been able to work out the mystical process you need to go through to get an appointment. My experiences of these Walk-​in centres though is — DO NOT BOTHER. they usually just tell you to go see your GP, and even when it is blatantly obvious, even to a one eyed cockatoo, what the treatment is to your ailment, they say they cannot prescribe.
Anyone know a good Witch Doctor, or someone with a set of hungry leeches?