(1)This section applies where it is proposed that the work to which an initial notice relates should be varied.
(2)If—
(a)a notice in the prescribed form (called an “amendment notice”)—
(i)is given to the local authority by whom the initial notice was accepted, and
(ii)is jointly given by the approved inspector who gave the initial notice and by the person shown in the amendment notice as the person intending to carry out the relevant work,
(b)the amendment notice is accompanied by such plans of the proposed variation as may be prescribed,
(c)the amendment notice is accompanied by such evidence as may be prescribed that—
(i)a scheme approved for the purposes of section 47 above applies, or
(ii)the insurance cover prescribed for those purposes has been, or will be provided, in relation to the relevant work, and
(d)the amendment notice—
(i)is accepted by the local authority giving notice of acceptance within the prescribed period to each of the persons by whom the amendment notice was given, or
(ii)is deemed to have been accepted by the local authority by virtue of subsection (5) below,
the work to which the initial notice relates shall be treated as varied as proposed in the amendment notice.
(3)A local authority to whom an amendment notice is given—
(a)may not reject the notice except on prescribed grounds, and—
(b)shall reject the notice if any of the prescribed grounds exists.
(4)Where the relevant work is of such a description that, if plans of it had been deposited with the local authority, the authority could, under any enactment, have imposed requirements as a condition of passing the plans, the local authority may impose the like requirements as a condition of accepting the amendment notice.
(5)Unless, within the prescribed period, the local authority to whom an amendment notice is given give notice of rejection, specifying the ground or grounds in question, to each of the persons by whom the notice was given, the authority is conclusively presumed to have accepted it and to have done so without imposing any such requirements as are referred to in subsection (4) above.
(6)Section 47(5) shall apply in relation to the form prescribed for an amendment notice as it applies in relation to the form prescribed for an initial notice.
(7)In this section, references to the relevant work are to the work to which the initial notice, as proposed to be varied, relates.]