Joint application for referral of question of law to High Court / insurer raised limitation defences / parties agreed that question of limitation periods be referred to High Court / Canterbury Earthquakes Insurance Tribunal Act 2019, s53 / Limitation Act 2010, s11 / Earthquake Commission Act 1993, s18 / HELD / two questions approved / wider public interest & common issue / where insurance policy provides “top up” cover for damage exceeding statutory cap, does the primary period under Limitation Act begin on the occurrence of the insured peril, or on date the claim has been confirmed as exceeding statutory cap / can insurer’s duty of utmost good faith act as a barrier to reliance on Limitation Act defence