Hi Sara,
who told you about the prolapse? You might be able to ask them for the referral you're looking for?
The NHS has always made the point that if you go abroad or privately they won't take care of things, but if you went with a UK DR, then I could see them possibly trying to overlook it.
Another possible solution is approaching your original surgeons office, they might only do free revisions within a year but it might be th surgeon is still willing to waive fees if you pay for the operating room and anesthesia, otherwise he or she might be able to point you in the right direction in regards to funding through the NHS.
Look for the names and contact info for the funding authorities where you are located... These people might be able to guide you p.
Good luck