...shall be admitted in proof of any breach or objection of which particulars are not so delivered. (2.) Particulars delivered may be from time to time amended by leave of the Court or a Judge. (3.) When a patent has been revoked on the ground of fraud, the Registrar may, on the application...

...objections on which he means to rely, and no evidence shall, except by leave of the Court or a judge, be admitted in proof of any objection of which particulars are not so delivered. Then in section 29 you will find that repeated in almost the same words in sub-sections 2 and 3, followed...