Excesses (or shared liability) usually work on an annual basis.
Typically you'll pay 10% of the cost of any procedure up to a maximum of, say, £2k per year. Regardless of the number or severity of conditions you have.
Similarly for prescriptions but that hopefully would be offset by pharmacists being able to offer you generic meds and zero prescription charges.
I'm nothing to do with any party so these are just my thoughts.
I imagine the premium would be relatively static in such a social insurance model (as opposed to genuinely private health insurance that factors in risk) so people with severe/chronic conditions are not priced out of health care and there is no gender disparity.
The (private) model that I (late 60s) looked at recently had premiums of c.£150/month on a shared liability of £4k. Other options existed that rebalanced those two figures.
I dont see why cost would/should be passed on to businesses (they already seem to be far too much an extension of the welfare state) but I imagine those who already provide private healthcare might pick up some of the tab in place of that as health provision improves enough.
I imagine elective procedures such as IVF would either incur a higher premium or some other excess.
GP's... who knows. I'm not convinced by the "charge and you'll reduce cancellations" argument. I think charging for a diagnosis would be a bad idea - I'm generally for early identification and treatment of any problem. But I daresay there would be some limit on free GP appointments to discourage abuse (that's why prescription charges were introduced early in the NHS life, when you could keep mislaying your glasses and just get another free pair). Say 6 patient-requested appointments free per year.
What do you think?