Hi Crisps,
That was unfortunate experience but not typical. Worrisome (above) bears that out. I think it's worth persisting with the NHS because you shouldn't have to pay twice i.e. tax to fund the NHS and then fees etc. to go private.
In the end people have to do what's best for them and that might sometimes mean they have to go private to kickstart the process but to get the best out of the NHS you sometimes have to be assertive and persistent.
There's an example from my life that may be useful to people here: My husband was suddenly taken ill one night. He was seen immediately by an A & E consultant who treated him appropriately and panic over but I was unhappy because I thought he had missed something important which proved correct.
Hubby had a very swollen tongue which threatened to choke him but what was odd was that the swelling, though enormous, was one sided. Antihistamines and steroids quickly reduced it so I was able to take him home.
But I was puzzled and spent some time online doing homework. Long story short I found that the problem was probably a rare reaction to a blood pressure medication which can happen without warning even if you've been taking the stuff for years.
I printed off a learned paper on the subject and sent husband off to GP with it. GP said "I've never heard of this but I think your husband might be right" and referred him to a consultant, as an emergency, who saw him within hours. The guy confirmed my suspicion and took him off the offending medication, substituting another. Problem solved.
At no point in the process did I think it would be best to go private. That's a lot because the NHS has expertise and facilities which are just not available privately unless you are loaded. Again the NHS can react very quickly if the need is seen - you just have to make them see it.