On Monday morning, I sat through a near four-hour long webinar where senior civil servants from the UK government, its customs, agriculture, food safety and business agencies and Irish Revenue briefed Irish businesses on the state of Brexit play less than 60 days before Britain leaves the EU single market and customs territory. From a business perspective, two things clearly emerged: there is already a mountain of new requirements companies trading with the UK need to be prepared for. And there is a second mountain coming for which they cannot prepare because utter uncertainty continues to reign, including among British…