I'm sure most here are aware of the need for customs declarations for shipping to the EU. But are you aware of the other customs changes?

Buying from abroad - there will no longer be a £15 VAT waiver on imported goods. So anything you buy from another country will incur VAT on item + postage.
Gov.uk say it will be up to the merchant [if selling from your own site] or the online market place [not sure if Gazza will be adding VAT at checkout for relevant transactions] to claim the VAT. Non UK businesses will have to register for VAT in the UK.
Feebay has already marked some overseas items as VAT will apply. Also not sure what will identify items VAT has been charged or not

https://www.gov.uk/government/public...1-january-2021