If the Treasury act as regards an authorisation under a relevant paragraph, the paragraph concerned shall have effect subject to their power to act later, as regards the same authorisation, under the same or (as the case may be) another relevant paragraph.

If the Treasury act later as mentioned in sub-paragraph (1) above that sub-paragraph shall apply again, and so on however many times they act as regards an authorisation.

If the Treasury act as regards an authorisation under a relevant paragraph the paragraph concerned shall have effect subject to their power to act later, as regards the same authorisation, under paragraph 8 above.

For the purposes of this paragraph the relevant paragraphs are paragraphs 9 to 11 above.