Every reference under section 13 above shall specify a period (not longer than six months beginning with the date of the reference) within which a report on the reference is to be made.
A report of the CMA on a reference under section 13 above shall not have effect (and no action shall be taken in relation to it under section 15 below) unless the report is made before the end of the period specified in the reference or such further period (if any) as may be allowed by the Office of Rail and Road under subsection (3) below.
The Office of Rail and Road may, if it has received representations on the subject from the CMA and is satisfied that there are special reasons why the report cannot be made within the period specified in the reference, extend that period by no more than six months.
No more than one extension is possible under subsection (3) above in relation to the same reference.
The Office of Rail and Road shall, in the case of an extension made by it under subsection (3) above—