Ok. You need to write to the bank and make a formal complaint, ask that it is removed within the next fourteen days or say you will go to court.
If they do not then you can issue proceedings using form part 8:
The court will list the matter for hearing and decide whether to make the bank remove it. If the court does and they refuse this is contempt of court.
The data protection act says
14Rectification, blocking, erasure and destruction.
(1)If a court is satisfied on the application of a data subject that personal data of which the applicant is the subject are inaccurate, the court may order the data controller to rectify, block, erase or destroy those data and any other personal data in respect of which he is the data controller and which contain an expression of opinion which appears to the court to be based on the inaccurate data.
Can I clarify anything for you about this today please?