If the interest of the Board in the site is insufficient to enable them to grant the right to moor the houseboat there for an indefinite period, the period for which that right subsists shall not extend beyond the date when the estate or interest of the Board determines.

If planning permission for the use of the site as a mooring has been granted in terms such that it will expire at the end of a specified period, the period for which the right to moor the houseboat at the site subsists shall not extend beyond the date when the planning permission expires.

Paragraph 3 above shall not prejudice or affect the right of the Board to move or to require the removal of the houseboat under section 19 (Removal of vessels to permit works, etc.) of this Act or any other powers available to the Board but, if they so move or require the removal of the houseboat during the period of validity of the certificate, the Board (unless they would be entitled under paragraph 6 below to determine the certificate) shall make available for it a suitable mooring or other location (which shall be broadly comparable to the site) situated as near as is practicable to the site, and shall permit the houseboat to be replaced at the site as soon as practicable after the circumstances necessitating the removal have ceased to apply.

Any costs and expenses occasioned by the removal and replacement of a houseboat under sub-paragraph (3) above shall be paid by the Board.