The VAT or EORI field is where booksellers should put the GST on the Royal Mail form.
Example: A seller is located in the UK and using Royal Mail as the courier. The package is going to Canada. The seller would put the GST in the VAT or EORI field on the custom's form.There are two types of form, depending on the value of the items sent. Please make sure you use the correct one:
1. For items with a value up to £270 use:customs declaration form CN22
2. For items with a value over £270 use: customs declaration form CN23. It should be attached using the plastic wallet available from Post Office® branches.