26. Nothing in paragraph 19 or 25 shall preclude DLRL from submitting at any time, or from time to time, but in no case less than 28 days before commencing the construction of any specified work, new plans thereof instead of the plans previously submitted, and thereupon the provisions of those paragraphs shall apply to, and in respect of, such new plans save that the reference in paragraph 25 to 42 days shall be treated as a reference to 21 days.