If a purchaser or his successor in title enters into an agreement within subsection (3), any liability arising under the covenant required by section 11 shall be determined as if a relevant disposal which is not an exempted disposal had occurred at the appropriate time.
In subsection (1) "the appropriate time" means—
An agreement is within this subsection if it is an agreement between the purchaser or his successor in title and any other person—
Such an agreement is within subsection (3)—
The Welsh Ministers may by order provide—
An order under subsection (5)—
In this section—
"agreement" includes arrangement;
"the discount repayment period" means the period of three or five years that applies for the purposes of section 11(2) (depending on whether an offer such as is mentioned in section 199(3) of the Housing Act 2004 was made before or on or after the coming into force of that section).