Did a quick browse here so if I miss or misinterpret something feel free to point it out.
Ok, the UKGC has basically provided UKGC licensed casinos with a "lock-out" clause in their licensee rules (officially called the
or LCCP). That clause says that all UK licensed casinos must designate an ADR to handle player disputes that are not resolvable by the casino AND that they have to abide by the ADR's ruling in cases where the total value of the case is less than £10K (that last bit may be out of date, I'd have to sift through the LCCP to be sure and TBH I'd rather be shot in the face). Most significantly
there is no mention of listening to or even acknowledging any other ADR regardless of the player's choice, preferences, or situation.
Anyhoo, the bottom line is that once a
designated ADR gives a ruling on a case the UK licensed casino will never go against it unless they want to have their license go under review by the UKGC. In other words if the designated ADR says the sky is green then as far as the UK licensed casino that uses them is concerned the sky is green. The chances of having that decision re-examined and/or reversed is very, VERY slim.
That said decision reversals have happened. If it were me and I was in the OP's shoes -- meaning the designated ADR had given a decision which I felt was wrong and/or inappropriate -- I'd write up my argument, provide whatever evidence was necessary to back up my case and POLITELY resubmit it to the designated ADR and ask them VERY KINDLY to please have another look. Sound like fun? Hell no, but that's the situation that UK players are in insofar as the designated ADRs go thanks to the UKGC: it's their way or the highway pretty much without exception.
If it's not already obvious the answer is no, there isn't much point in submitting a PAB to us now that the designated ADR has already ruled. No matter what we say nobody is going to listen: the casino, the designated ADR and the UKGC are all playing from the same sheet music here -- the LCCP -- and everyone else can go ... bark up a tree, to put it politely. In the off chance that the OP is simply curious if we, for example, would rule the same as the designated ADR then yes, a PAB would be worthwhile, but only in that circumstance.