Allira
If a private hospital is going to perform operations they will need an ICU facility in case of post-operative problems but I know the one near here will send patients to an NHS hospital if necessary.
Any patient admitted as an emergency eg with pneumonia, would be taken to an NHS hospital.
I know that to be the case too Allira. The vast majority of private hospitals are not geared up for medical, as opposed to surgical, patients, they don’t have the facilities or the staff cover to deal with them, and i know from experience that complex medical cases are always transferred to the NHS. Some NHS hospitals also have private beds, but use the services of the NHS and cross charge.