Preparing for Brexit when you have Addison's or Adrenal Insufficency - 08/12/2020 Reviewed 24/12/2020. Awaiting updates. Professor Simon Pearce has put together this guide to the things you need to prepare for and how to keep well as the UK leaves the EU in 2021. You may wish to download and print it so you can also discuss it with those that care for you or medics. Read our ADSHG Brexit Guide (PDF 516kb - Opens in new window).