No person shall be liable in tort under the law of England and Wales—
(a) to any other person on the ground only of his having induced the wife or husband of that other person to leave or remain apart from the other spouse;
(b) to a parent (or person standing in the place of a parent) on the ground only of his having deprived the parent (or other person) of the services of his or her child by raping, seducing or enticing that child; or
(c) to any other person for harbouring the wife or child of that other person,
except in the case of a cause of action accruing before this Act comes into force if an action in respect thereof has been begun before this Act comes into force.