16.—(1) Where an existing SED installation installed abatement equipment on or after 1st April 2001 and before the coming into operation of the SED Regulations, the prescribed date for the affected part shall be –
(a)where an application for a permit authorising the operation of that part of the installation is duly made before the expiry of a period 4 months from the date of coming into operation of the SED Regulations, the determination date for the SED installation;
(b)where no such application is made, the expiry of the period of 4 months from the date of coming into operation of the SED Regulations.
(2) Subject to sub-paragraph (3), where after the date of coming into operation of the SED Regulations abatement equipment is installed in an installation, the prescribed date for the affected part shall be the date on which the abatement equipment is installed if earlier than the date which would be the prescribed date for the SED installation under this Part.
(3) Where the abatement equipment is to be installed in an installation in respect of which the operator has made an application to use a reduction scheme, the prescribed date for the affected part shall be the determination date for that affected part.