Any reference in the following provisions of this section to a notice is a reference to a notice of increase under section 12 or section 14 of this Act.

Notwithstanding that a notice relates to periods of a statutory tenancy it may be served before the statutory tenancy begins.

Where a notice is served before the statutory tenancy begins, and the protected occupancy could, by a notice to quit served at the same time, be brought to an end before the date specified in the notice of increase, the notice shall operate to terminate the protected occupancy as from that date.

If the county court is satisfied that any error or omission in a notice is due to a bona fide mistake on the part of the landlord, the court may by order amend the notice by correcting any errors or supplying any omission therein which, if not corrected or supplied, would render the notice invalid and if the court so directs, the notice as so amended shall have effect and be deemed to have had effect as a valid notice.

Any amendment of a notice under subsection (4) or (5) above may be made on such terms and conditions with respect to arrears of rent or otherwise as appear to the court to be just and reasonable.

No increase of rent which becomes payable by reason of an amendment of a notice under subsection (4) or (5) above shall be recoverable in respect of any period of the statutory tenancy which ended more than six months before the date of the order making the amendment.