(1) A period extended under section 138A(2) may also be extended under section 138A(3), and a period extended under section 138A(3) may also be extended under section 138A(2).

(2) No more than one extension is possible under section 138A(2).

(3) Where a period is extended or further extended under section 138A(2) or (3), the period as extended or (as the case may be) further extended shall, subject to subsections (4) and (5), be calculated by taking the period being extended and adding to it the period of the extension (whether or not those periods overlap in time).

(4) Subsection (5) applies where -

(a) the period within which the CMA shall discharge its duty under section 138(2) is further extended;