Patient Registration/Removal
BMA Guidance: Patient Registration - rules regarding temporary residents, homeless patients, overseas visitors, the duty to give treatment, and when they can decline to register a patient. This guidance will clarify the conditions surrounding patient registration in GP practices in England. The main principle is that anyone, regardless of nationality and residential status, may register and consult with a GP without charge.
BMA Guidance: Removing patients from your practice list
Dealing with Difficult Patients & Removal of Patients from GP List - LMC Guidance
GMC Guidance: Ending your professional relationship with a patient