That's sort of hard to work out (it depends how what you mean by the average - the average of the taxed population or the average per capita, for example and the NHS's bill isn't separated off from the rest of it on your payslip). Interestingly however, it's probably less than a US taxpayer pays. According to the WHO in 2006 (latest figures I could find with a quick google) the US government spent $3,076 per capita, whereas the UK government spent $2,457 (using price purchase parity). For reference the total per capita healthcare (i.e. both public and private) was $6,719 for the US and $3,332 for the U.K.

And this is a very good thing. Over-prescription of broad-spectrum antibiotics leads to drug-resistance emerging (at best) earlier than it would otherwise do. This can be compounded by not completing the course (which is a lot more likely if you weren't that ill in the first place - you may well stop when you start to fell better).

Which means that not only is it not true that you can't get antibiotics when you need them under a "socialised" health care system, but it's also the case that we're all better off because you don't get antibiotics when you don't really need them.

An ultimately I believe from Terry Pratchett. I can't remember which one though..