Coutts are a very exclusive bank for the very rich and it is not for the likes of you and me. They select their customers. Admittedly the handling of the matter may be poor but surely they can accept or reject who ever they want . If , for example we had a political figure akin to Oswald Mosley in the last century, would you say the same about his right to bank with royalty.?
The Co Op Bank has an ethical policy which means that , for example ,if a CEO of a company making land mines wanted an account, they would tell him to go elsewhere. Is that policy under threat now?