Pruddie Rudford

Hi, I have a website selling various home decor items to UK customers. I am a UK citizen living in the UK. My question is: If I sell an item costing over £135 via my website, to a buyer in the UK and a supplier in Greece then sends that item direct to my buyer in the UK, am I responsible for any of the import VAT or other tax or is that all down to the supplier or the UK buyer? I.e do I just sell the item as I would normally do to a buyer in the UK and let the buyer then pay any import duty and VAT due when the item arrives in the UK or is there anything extra I have to do? I am not UK VAT registered. Do I need to be to do this? My turnover is below £85,000. I believe the supplier in Greece would need to be VAT registered in the UK to supply my UK customer? Is it my problem if it turns out he is not or his?