Thank you mumsnetters. This was prompted by someone needing to stay under radar, due to stalking, and moving fast without documents. There is no existing photo-I.D., and no medical records or NHS number. There is, as it happens, a right to be in the country and to get NHS treatment. But it seems the organisations of advocates who would champion a migrant would, understandably, not champion someone who is not a migrant.
There are other organisations, but also exclusively for their own intended clients, such as learning disabled, or mentally ill, or addicts, or street homeless.
There's an almost comical twist, where the NHS sites advocate people should "seek advice from their local C.A.B.". Hmm, that requires, you guessed it, proof of living permanently within the catchment area of a C.A.B. 😆
The insistence on a passport plus a permanent address is pretty worrying, for the millions who are 'hidden homeless', sofa surfing, living in vans or houseboats or moving frequently. A radio 4 item mentioned this in passing, then The Times' G.P. said his own practice does accept, and treat, transiting people.
At times, several of the sofa-surfers' hosting friends have tried to fight their own GP receptionists or practice managers, explaining they have someone staying with them, but not permanently, and not with previous GP records or passport ID. In no case are lists entirely closed to new patients, but in no case will they take a new patient who has no permanent address and passport.
Private GPs have urged attention for a possibly serious need, and have suggested if an NHS GP cannot be found, A&E should be used. But an A&E hospital, sufficiently alarmed at the symptoms to take tests, would not disclose results, saying these can only be sent to the patient's NHS GP. 🙄
The option of going to a Trust and asking them to force a GP to accept a patient, will probably fail unless said patient can prove a permanent address, within the Trust area, but also within one particular catchment area.