[FARM DEBT MEDIATION] - whether plaintiffs are able to bring proceedings for rectification of a Deed entered into after successful Farm Debt Mediation - policy of the Farm Debt Mediation Act 1994 - relationship between s 15 (excluding evidence) and s 16 (prohibiting disclosure) of the Act - [WORDS AND PHRASES] - meaning of "lawful excuse" in s 16(e) of the Act.