6.—(1) Where a Committee are satisfied that a craft certificate has been wrongly issued to a worker by them as a result of a mistake or incorrect information they may revoke the certificate, and shall do so unless, on such revocation and on surrender to them of the revoked certificate, they would immediately be obliged under regulation 5 above to issue another certificate to the same worker in identical terms with the exception of the date.
(2) Before revoking a craft certificate a Committee shall serve notice that they propose to do so on the worker to whom the certificate relates, setting out their reasons and offering him the opportunity of making representations to them against the proposed revocation, and shall consider any representations he may make.
(3) Where a Committee have revoked a worker's craft certificate they shall not issue him with another craft certificate until the revoked certificate has been surrendered to them or they are satisfied that it has been destroyed or lost.