What would you advise

Is your friend suggesting you make a complaint ? Sorry, I think predictive text plays a part at the end of your post.
If so, the first thing to do would be to contact P.A.L.S. at the hospital.

If you’re offered an operation at a private hospital it’ll probably be the same surgeon doing the operation as would do it in an NHS hospital. In effect the NHS are just renting the theatre and the bed. Go for it.

Yes. I would think that is what is happening here. Just wondering why the ten visits, and if the poster has been given a date for the op.

I think private hospitals sometimes take nhs patients at no cost, if they've the beds available.
If that is what's being offered, then go for it.

Sadly I think you are going to have to go through the second operation and see if that puts things right. Have you been given a date for the op? What do they do when you visit the private clinic?