Buyers are responsible for any customs and import taxes that may apply in their country.
Please note if you are purchasing from outside the UK you may be charged import and customs fees at destination. Please insure you do your due diligence and research how you are affected by customs and import taxes in your country before making a purchase.
If you are in the EU you may find this helpful : https://ec.europa.eu/taxation_customs/buying-goods-online-coming-non-european-union-country_en
If you are in the USA you may find this helpful : https://www.cbp.gov/trade/basic-import-export/internet-purchases