Shannon Chamber would encourage all member companies, or indeed any company that is trading with the UK, to review their supply chain(s) as appropriate (particularly those businesses who are importers), register for an EORI number, register for VAT and speak to a customs clearance agent.
Below is a guidance factsheet, published by Chambers Ireland in January 2019. Please do not hesitate to contact Shannon Chamber admin@shannonchamber.ie should you have a specific query that warrants further research.
Govt Report
https://merrionstreet.ie/en/News-Room/News/Publication_of_Brexit_Contingency_Action_Plan_Update.html
Chambers Ireland Press Release
https://www.chambers.ie/news/businesses-must-actively-prepare-for-worst-case-brexit-scenario/
Brexit Resources