Amazon will continue to fulfil orders across the UK and mainland Europe and distribute your Pan-EU inventory according to demand forecasts for each country, including the UK, until mid-December of 2020.
You should take advantage of cross-border goods movements by shipping inventory prior to this deadline, however, we recommend you to keep 4-8 weeks of cover in the Amazon network and start planning for the new shipment model changes now, so you are well prepared for January 1, 2021.