Re: CAA and lens implants
I had an extended opthalmological (sp) examination in February at Gatwick. I was under the impression that LASIK was allowable but that ICL (implantable contact lens) were not. The optician there pointed out that this is not true - they treat each case on an individual basis, implication being that ICL's may be acceptable.
You could write to them/phone, or even book an extended opthalmology. Don't expect them to offer any encouragement though.
If you haven't done so already, I'd run your prescription past all of the LASIK providers. They all seem to have different treatment ranges.
Good luck.