There is V. A. T. (Value Added Tax) of 17.5% on everything bought in the U.K. But if I remember rightly, when visitors to Scotland wanted to buy Malt Whisky they could minus VAT if they had it shipped back to the USA at the point of purchase. That usually applied to a 12 bottle case. If you bought something via the internet from a UK supplier, I don't think you would pay VAT.
If I buy from the USA, I don't pay US taxes, but the UK Customs & Excise dept, who collect all VAT, make me pay before I can collect my item.
As the old saying goes "Nothing more sure than Death or Taxes".