I have an offset mortgage with them and they unilaterally removed the offset element a few years back for all customers. Following complaints to the ombudsman they had to reinstate the offset element and pay compensation. There is a long, comprehensive thread about this on boards.ie.
Right so a totally different matter and at their discretion. Compliance with the money laundering laws and directives is not a discretionary matter and taking one as a precedence for the other is not very wise.
I have no idea what Dankse/Pepper will do with someone who fails to comply, but what I can say for experience is that the half hour or hour you will spend updating your details is nothing compared with the countless hours will spend if your name gets on the black list and the authorities start an investigation.