There will always be a need for a degree of rationing within any universal system, but that's why we have politicians (useless though they are) and health boards who make decisions on which drugs/equipment should be used by the NHS for patient care, based on financial cost and health benefits etc.
Otherwise it would be down to a free for all as to what should and shouldn't be provided on the NHS.
Personally I would ban the use of chemotherapy drugs and radiotherapy for treating cancer patients, they are incredibly expensive and seem to harm far more patients than help them. But that's my personal opinion. Just as your opinions are yours. It would all come to people's own biases/perceptions.