40.Paragraph 10 provides that where a landlord has completed a notice which does not take proper account of paragraphs 1 to 9 and therefore relies on the wrong notice period, such notice is not invalid but can only be relied upon by that landlord to seek eviction in accordance with the correct notice period. Subparagraph (2) provides that the period for which that notice remains in force is also calculated with reference to the correct notice period. Subparagraph (3) specifies the notices to which paragraph 10 applies.