VAT, customs duties and handling fees may all need to be paid. Customs charges are the responsibility of the customer. They cannot be paid in advance and are levied only when the item reaches the UK.
For cork products customs duties may also apply, which can range from 0% to 25% of the product you're buying. The extra charges are usually collected by the courier on behalf of the government, with customers asked to pay before they can pick up their package.