PremiumMike ThorpeSenior journalist·NZ Herald·29 May, 2026 01:00 AM5 mins to read‌Matthew Horncastle and the billboard that has sparked a complaint to the Advertising Standards Authority.Outspoken property developer Matthew Horncastle has taken aim at the Advertising Standards Authority after a complaint about a political billboard.

The ASA received the complaint from a member of the public about a digital message that was approved by Horncastle and displayed on a billboard owned by the Christchurch-based developer.