EORI is the Economic Operators Registration and Identification number, which is required for moving goods to the UK.
Make sure you apply for the EORI number.
Only businesses that have the GB EORI number can ship to the UK.
To make sure your orders get fulfilled, you need to enter it in your Supliful account under settings (Additional billing details).
In case a UK order comes in, and you did not enter the EORI number, the order will be automatically placed on hold.