I am not well informed but is it not more of an accreditation authority than a dispute resolution forum in itself? Anyone practicing ADR can apply to be a member and it regulates the industry in a soft way but would be more useful if you had a dispute with an arbitrator, rather than a third party.
Arbitration is the most regulated form of dispute resolution short of going to court but only works when both parties agree to the outcome. It tends to be cheaper and perhaps less confrontational though. You can find professional arbitrators with chartered institute accreditation and a particular area of specialisation via:
Take all this with a pinch of salt as I got a law degree over a decade ago and have forgotten all the aspects that don’t involve people getting their hands chopped off in comical accidents.
― Wag1 Shree Rajneesh (ShariVari), Wednesday, 21 November 2018 14:30 (seven years ago)