Paragraph 63.15 Claim for infringement of registered trade mark
(1)
In a claim for infringement of a registered trade mark the defendant may—
(a)
in his defence, challenge the validity of the registration of the trade mark; and
(b)
apply by Part 20 claim for—
(i)
revocation of the registration;
(ii)
a declaration that the registration is invalid; or
(iii)
rectification of the register.
(2)
Where a defendant applies under paragraph (1)(b) and the relief sought would, if granted, affect an entry in the United Kingdom register, he must serve on the registrar a copy of his claim form.