5.—(1) The proprietor of the patent concerned or any other person wishing to oppose an application under regulation 3(1) may, in accordance with rules, give to the Comptroller General of Patents notice of opposition and on giving such notice shall pay the prescribed fee.
(2) On receipt of a notice of opposition under paragraph (1) and payment of the prescribed fee, the controllers, in deciding whether to grant an application under regulation 3(1), shall consider and process any opposition in accordance with rules.