166.This section provides for the possibility that an advance notice may be discharged by the proposed granter of the protected deed if the potential grantee consents. While advance notices do not freeze the Land Register, they may make a property effectively unmarketable to anyone other than the grantee of the deed referred to in the advance notice. The section allows (where, for example, the sale has fallen through) for the parties to bring the advance notice to an end before the 35-day period has elapsed. Subsections (4)(b) and (5) extend the same rule to the Sasine Register.