The provisions of sections 242(2) and 243(2) shall have effect subject to this section.
An election under subsection (2)(b) above shall be made—
for the purposes of capital gains tax, on or before the first anniversary of the 31st January next following the year of assessment in which the part disposal is made;
for the purposes of corporation tax, within 2 years after the end of the accounting period in which the part disposal is made.