Only our UK customers have to pay VAT (but other customers may be liable for a customs charge depending on the import policies of your country/economic market/zone).
Our shopping cart automatically calculates whether VAT is applicable and clearly displays it when you go to checkout. Sometimes it requires confirmation of which country you are in, in which case it waits for the delivery address to be entered in the checkout process.
You will not be unfairly charged sales tax of any kind. We are required to charge VAT to our customers within the United Kingdom. Outside the UK, customs charges may apply (which are roughly equivalent to the 20% sales tax UK customers pay).