No obligation as to secrecy imposed by statute or otherwise on persons employed in relation to Inland Revenue shall prevent information obtained in connection with the assessment or collection of income tax chargeable under Schedule E from being disclosed by or under the authority of the Commissioners of Inland Revenue in connection with the operation of any enactment or regulation relating to the calculation or collection of graduated contributions under this Act or under any corresponding legislation of the Parliament of Northern Ireland, or of other contributions collected in the same way as any such graduated contributions.