The document assesses 20 critical areas according to a traffic light system

Border disruption - red
UK nationals in EU - red
Oil supply - amber
Chemical supply - amber

‘Border disruption could lead to disruption in supply of critical chemicals for food, water, medicine’ pic.twitter.com/YaA3QDoVGG

— Carole Cadwalladr (@carolecadwalla) November 25, 2020