Just in the past couple of months I had a private GP appointment (£65), a MRI (£800), followed up by 2 consultant visits (£170 each) and 6 physio (£35 a go). About £1400 of treatment all for free.

I might have been able to get the same treatment on the NHS (this was for a running injury, so not a life-critical illness), but the doctors, MRI, and two consultants visits were done on consecutive days - i.e. within a working week I went from "ow my knee hurts" on a Monday morning to having seen a doctor, a consultant, getting an MRI, and then seeing the consultant again who prescribed a course of physiothearapy by Thursday afternoon (the physio was also booked the same day).

With the NHS it probably would have taken two or three days to call at precisely 08:30:00 to get an appointment before they book out, then I'd be waiting minimum two weeks before I even went to that first GP appointment, and I am sure their response would have been "stop running and see if it gets better in 3 months - come back if it hasn't. NEXT." (based on experience)

Seems like a good deal to me.