Lets compare apples with apples:
Saying the healthcare is in a "shambolic state" and comparing it to SA medical aids is laughable.
UK NHS = SA public health care (both free to citizens).
UK private health care = SA Medical aid
Form your above statement you almost make it sound like one is limited to the NHS in the UK? There are no restrictions to join a private medical aid.
My personal experience with HMRC, DVLA, Home office, NHS, The Local Council, Royal Mail, etc etc has been nothing short of spectacular directly compared to my experiences back in SA with similar offices.
Please provide some input on what you base this statement on?
One could argue that there is reliable, accessible public transport in the UK, and there is very limited such option in SA.
You can make the same argument by saying: "yes, but your utilities are extremely expensive". Certainly true, but I have the option to actually use electricity when I choose too.