At any time after the registration of a design any person may apply to the comptroller for the cancellation of the registration on the ground that the design is used for manufacture exclusively or mainly outside the United Kingdom, and where such an application is made the provisions of this Act with respect to the revocation of patents worked outside the United Kingdom (including those relating to costs) shall apply with the necessary modifications, except that there shall he no appeal from the decision of the comptroller.

Such ground as aforesaid shall he available by way of a defence to an action for infringement of the copyright in the design.