Where, after a secure tenant ("the former tenant") has given a notice claiming the right to buy, another person ("the new tenant")—
the new tenant shall be in the same position as if the notice had been given by him and he had been the secure tenant at the time it was given.
If a notice under section 125 (landlord's notice of purchase price and other matters) has been served on the former tenant, then, whether or not the former tenant has served a notice under subsection (1) of section 125D (tenant's notice of intention), the new tenant shall serve a notice under that subsection within the period of twelve weeks beginning with whichever of the following is the later—
In subsection (2)(b) " the relevant event " means—
The preceding provisions of this section do not confer any right on a person required in pursuance of section 123 (claim to share right to buy with members of family) to share the right to buy, unless he could have been validly so required had the notice claiming to exercise the right to buy been given by the new tenant.
The preceding provisions of this section apply with the necessary modifications if there is a further change in the person who is the secure tenant.