Waikato Regional Airport Ltd & Ors v. Attorney General (New Zealand)

Factual and Procedural Background

The consolidated appeal concerns cost-recovery charges imposed by the Director-General of Agriculture and Forestry for biosecurity inspection services at newly-approved regional airports in The Country. In 1995 the Director-General decided to recover the full costs of border-control staff and equipment from regional airports operated by Company A and Company C and from an airline, Company B, while continuing to provide the same services at long-established metropolitan airports without charge to passengers. The charges were levied pursuant to the Biosecurity Act 1993, particularly s 135, which obliges the Director-General to recover unfunded costs “in accordance with the principles of equity and efficiency.”

Company A, Company B and Company C brought two sets of judicial-review and restitution proceedings before Judge Wild, who declared both the 1995 cost-recovery decision and a second, more formal 1998 decision unlawful and ordered partial restitution. The Court of Appeal (five judges) reversed that outcome and dismissed the restitution claims. The present judgment is the decision of the Privy Council on further appeal.

Legal Issues Presented

1. Whether the 1995 and 1998 decisions to impose full cost-recovery at regional airports, but not at metropolitan airports, complied with s 135 of the Biosecurity Act 1993.
2. Whether those decisions were invalid for want of proper delegation and/or because they relied on erroneous or irrelevant considerations.
3. If invalid, whether payments made under the impugned decisions are recoverable in restitution and, if so, on what basis.

Arguments of the Parties

Plaintiffs’ Arguments

• The Director-General failed to apply the statutory principles of equity and efficiency; the scheme was manifestly inequitable because only regional airports bore the costs.
• Parliamentary appropriations were not earmarked for metropolitan airports, therefore the dichotomy in charging could not be justified.
• Both decisions were infected by factual mistakes and irrelevant considerations, including a desire to discourage new market entrants.
• Money paid under ultra vires demands is recoverable as of right (Woolwich principle) or as money exacted colore officii.

Defendant’s Arguments

• The Director-General enjoyed a broad discretion under s 135 and was entitled to adopt differential charging during a transitional phase.
• The decisions were based on practical considerations of administrative efficiency and historic funding patterns.
• Plaintiffs received valuable services and suffered no loss because the charges could be passed on to users.
• Restitution should be refused due to delay, acquiescence and potential unfairness to the public purse.

Table of Precedents Cited

Court's Reasoning and Analysis

After reviewing the statutory framework, the Privy Council held that s 135 imposes a duty to recover unfunded costs through mechanisms that are both equitable (fairly distributing burdens) and efficient (administratively workable). The 1995 decision failed that test: it contained no consideration of equity or efficiency and was premised on the mistaken belief that parliamentary appropriations were earmarked for metropolitan airports. The 1998 decision, although facially reasoned, merely justified continuation of the inequitable status quo. Key analytical errors included:

• Mischaracterising parliamentary appropriations as tied to metropolitan airports.
• Confusing establishment costs with operating costs to suggest regional airports created new burdens.
• Relying on a pending shift to full cost-recovery to rationalise interim inequity.
• Invoking “risk creators should pay” while ignoring that higher-risk flights also used metropolitan airports.

Both decisions were therefore taken on erroneous or irrelevant considerations and fell outside the Director-General’s lawful discretion. The Board further rejected defences of delay, acquiescence, “passing-on,” and lack of consideration, finding no evidence that plaintiffs passed costs to passengers and noting their consistent objection to the discriminatory charges.

Holding and Implications

APPEAL ALLOWED. The orders of the Court of Appeal are set aside; the declaratory and restitutionary relief granted by Judge Wild is restored. The Defendant must refund to each plaintiff the excess sums paid over what would have been a fair, proportionate charge and pay the plaintiffs’ costs in all appellate courts.

Implications: The ruling confirms that public authorities must apply statutory equity and efficiency criteria when designing user-pays schemes; administrative convenience cannot justify discriminatory charging. While significant to the parties, the refund is not of a scale that endangers public finances and no new limitation on restitution was crafted.