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Scotland, Wales and NI do. And England has only a nominal charge.

Right, and I think that's it (SK does the "nominal charge" thing).

Most western countries do the "nominal charge" thing - which in this context is just about equal to zero.

For instance: German public health insurance buys a course of Sovaldi for EUR40,000 ($46,000), the patient pays a cost of EUR10 ($11.50).