Last week I had my usual 6 monthly check up at my Dentist (private) and I've got an ongoing issue that should have been sorted as a teenager, but wasn't because the succession of NHS dentists I've seen were fairly dismal - the only one that was any good accidentally over-gassed himself in his own chair.

To put it in a nutshell I've got crooked lower teeth that in time will cause my molars to crack and fall apart due to bite mechanics, at present it's only causing me to bite the inside of my lower lip occasionally, but will develop over time. I've got otherwise good teeth which if my parents and grandparents are anything to go by will last for 80-90 yrs if looked after, as my dentist said "nothing we can give you will be as good as what you've already got."
So what I'm asking is has anyone had any adult ortho work done? If so how much (very roughly) am I looking at to sort this issue?
Any replies gratefully received. Thanks, DG