The info on the colours is here: PAB listings in user profiles
Green means it's an Accred casino issue. Grey overrides all other clours and simply means "ongoing/work-in-progress".
Ah ok, gotcha. Thanks for the link.
It's not illegal, and since they took the bets, they have to pay up. It's more usual for bookies to ban those whom they feel are "too good" at predicting winners or playing games of chance. It seems likely that this was a money laundering issue, and WH were trying to verify the legitimacy of the funds deposited. The problem is that they may have gone too far in law, leaving them open to legal action from the player, and a rap on the knuckles from the personal data regulator as they are requiring the player to give them personal data relating to third parties.
However, the OP seems to have vanished, so we don't really know what the eventual outcome was, or if it's still ongoing.
(Sorry for the late response, I didn't think much about what you said until now.)
Well when are breaking T&Cs ever illegal? The line "suspected play-for-profit players will have their wins confiscated" could be in their T&Cs (kinda like movie theatres have rules about bringing food in). It's certainly unethical if they don't pay up, however as they're not accred here, they can write down whatever predatory T&Cs that they want.
My view is that the player should be paid even if there is such an above rule. He lives in the UK. He already demonstrated winnings to them from other casino sites. He can very easily use the excuse that he's a low-employed risk-taker who has been taking risks and getting lucky with credit card or other borrowed money.