You will have to pay Customs Duty, Import Duty, VAT, a probably "handling fee" for the Courier who will likely have paid the duty in advance, and VAT on that.
http://www.hmrc.gov.uk/
3. Charges
3.1 How are customs charges calculated?
Charges are raised by Customs staff at the postal depots where the packages are received. However, in some cases special arrangements are in place for goods purchased on the internet (see paragraph 3.4 below).
The amount of customs charges payable will depend on the type of goods imported and the value (converted using the rates of exchange for the month of importation as shown on the HMRC website) stated on the customs declaration (CN22/CN23):
Customs duty - this is usually charged as a percentage of the value. The percentage varies depending on the type of goods and their country of origin. Duty is charged on the price paid for the goods including any local sales taxes plus postage, packing and insurance costs. However, postage is excluded from the calculation for duty on gifts sent by post except for Express Mail Service (EMS).
Where the value of gifts is below £290 per consignment a flat rate of duty of 3.5% will be applied, but only if it is to your advantage.
Note: Customs duty will be waived if the amount is less than £7.
Excise duty - this is charged on alcohol and tobacco products and is additional to customs duty. The excise duty on wines and spirits depends on the alcohol content and whether wine is sparkling or still. Duty on cigarettes is based on the percentage of the recommended retail selling price combined with a quantity charge. On other tobacco products eg cigars or hand rolling tobacco, it is charged on the net weight.
Value Added Tax (VAT) - Import VAT is charged at the same rate that applies to similar goods sold in the UK. The value of the goods for import VAT is based on the value for customs duty plus any import duties charged.
