Me: definitely HLA B27 -ve - been done x2 by the most reliable method by a very reliable tester (the husband)
Diet: Been on it (and slipped off it a few times - don't tell anyone!) for nearly 3 years - not a MIRACULOUS CURE but maybe relieved 70% of my symptoms. I have loads of spinal damage, joint degeneration after finding the diet 30 years too late!!!
I also swear by liquid fish oil - stopping it makes me ache(low grade) all over the place. Most of my residual pain is most likely due to a combination of mechanical pain from joint damage and my sloppiness with the diet the last year or so.