The public system has serious flaws. I was told by the public system to take antibiotics for 6 months straight while waiting for a tonsil removal operation. Got my operation a few days later through my private insurance.
Private insurance is very much a supplement, not a totally parallel system in the UK:
https://www.moneyadviceservice.org.uk/en/articles/do-you-nee...
From the way you phrase it I assume you actually mean inefficient service, like you'd get at a high end restaurant or hotel, where they have lots of people hanging around doing nothing a lot of the time so no one ever feels they're being treated less than a VIP in busy periods.
Essentially, since sick people are more likely to choose such plans the costs are going to be very high. Either that or the restrictions on the plans need to be high to prevent it. Both make such plans unattractive independent of how bad or good the public plans are.
that's simply dishonest. there are tons of other variables to consider when pondering private insurance adoption rates.
Maybe they can't afford private insurance?
Ah, that's simply wrong, because you pay for public healthcare anyways (through taxes), hence private one is to be paid twice.
I doubt the system is `that bad`, but even in Russia, where private healthcare is super cheap (and very good) and public healthcare is a total disaster, a few people use the private one (until they are wealthy) due to exact same reason: they've already paid for the public one and feel like paying twice is not an option.