Tri-Star Customs and Forwarding Ltd v Denning - [1999] 1 NZLR 33

Contract — Mistake — Unilateral mistake — Respondents made unilateral mistake as to incidence of GST on sale of commercial building — Knowledge of purchaser — High Court found that purchaser had constructive knowledge of mistake — Actual knowledge required for relief — High Court had found purchaser had no actual knowledge — Contractual Mistakes Act 1977, ss 5(2)(b) and 6(1)(a)(i).

Equity — Rectification — Whether jurisdiction to grant relief where unilateral mistake had occurred — Relationship between s 5(2)(b) of the Contractual Mistakes Act 1977 and equitable jurisdiction — Contractual Mistakes Act 1977, ss 5(2)(b) and 6(1)(a)(i).