You may receive other requests for data you hold, which is not covered by any particular duty to disclose or to withhold.
For example, it could be information sought by police or other investigating or prosecuting authorities in connection with any criminal investigations, or the appointing local authority may request copies of canvass forms and registration application forms in connection with fraud investigations.
Although there is no right or duty of disclosure, you may supply such data if you feel that it is appropriate and are satisfied that to do so is in compliance with data protection legislation.
Where you are not satisfied, any such body would need to obtain a court order for its supply.