Where, in the case of any subsidence damage, the area of responsibility of any person as holder of a licence under Part II of this Act includes only part of the damaged land or, as the case may be, of the land where the damaged property was situated, then for the purposes of this Part—
shall be the responsible persons in relation to that damage; and
Subsection (5) of section 43 above shall have effect as modified by subsection (3) below in any case where—
In any case where, by virtue of subsection (2) above, this subsection has effect—
but paragraph (b) above shall be without prejudice to any rules of court in accordance with which the successor may be joined as a party to any proceedings in respect of any such rights or liabilities as are mentioned in paragraph (a) above.
In subsection (1) above the reference to the damaged land and to the damaged property are references, where only part of the land or property has been damaged, to the damaged part of that land or property.