Do NOT wait until your ill to register at a Doctors.
It will take longer than you think, I’d put aside a week from the point you decided toregister until the time you see a doctor.
You’ll likely need to take in some ID and fill in a load of forms, so you’ll need to know your previous Doctor’s name and address. Once you’ve proved who you are, you’ll probably need to wait another 48 hours for them to process your details and put you on their computer and of course, eventually you’ll have to wait until a doctor can fit you in.