19. The powers conferred by article 18 may be exercised by the shadow authority only—
(a)in the discharge of the functions specified or referred to in articles 12 to 15 and 17;
(b)in the same manner, and subject to the same conditions and limitations, as if it were a non-metropolitan county council or a non-metropolitan district council; and
(c)where the exercise of the power would involve incurring expenditure or acquiring a liability—
(i)with the prior consent of the County Council, where the expenditure or liability relates to a matter which, before 1st April 2019, is the responsibility of that Council in respect of its functions in relation to Christchurch; or
(ii)where the expenditure or liability relates to a matter which, before 1st April 2019, is the responsibility of a Borough Council, with the prior consent of that council.