Probably a racist joint !!
Tried to open an account and gave all the details. EU passport but a non-white person. The imbeciles decided to refuse to open my account and said that we cannot disclose the reason to refuse. With an outstanding clean credit record, I could find no reason why they refused. The only reason would be my skin colour didn't match the expectations of the skin colour they expect of their clients.

Edit :- The imbecile who wrote the below reply. If you are so sure of your standards why don't you reveal the reason to reject an application. And I don't have any issues with my credit and background. All are faultless. So the only reason I can think of is the racist methodologies used by your checking team.