Source: shutterstock A billboard advertisement from 2020 by the government informing businesses trading with the EU to act before the end of the Brexit transition period Ian King has a lot to get off his chest. The native of County Antrim is the chief operating officer of ZeroIgnition, a firm which spent a decade developing a fire-retardant chemical for use in construction materials before launching it in the lockdown-stricken year of 2020. But, during an hour-long phone call on a rare sunny afternoon in March, King (pictured) barely mentions the pandemic. What has caused the most upheaval to ZeroIgnition’s long-term business plan is something else entirely – the government’s Brexit deal.