My husband became ill. He was referred to a consultant, but the waiting list was 6 months. His family offered to pay for him to go private for the tests, so he did.
He went to the local NHS hospital for the tests, and the consultant he saw was also an NHS doctor. The bill included the hire of the NHS equipment. This consultant couldn't find what was causing DH's problem, so when his NHS appointment came, DH went along to that, and the new consultant diagnosed his condition straight away, and got it sorted.
So, going private in my husband's case was a complete waste of money.
I'm worried that your husband would be spending all of the family savings on this. Maybe if he didn't have an expensive hobby, there would be more savings, so using some for this op wouldn't leave you without any left.
But, I get the feeling that you don't get much say in things that involve the finances, which is a bigger worry really.
Yes, you should have a say, obviously. You should be able to discuss your fears about using all the savings, without being told you don't care about his health.