Taxes aren't included on any of the prices displayed on store as I ship internationally and every countries VAT is a different percentage. In the UK the government charge VAT at 20%. For example, in Australia its 10% and in Canada its 5% so it makes it difficult for me to charge all of my customers fairly as I do have a wide global audience.
Unfortunately tax is a legal requirement for any business in the UK and is a pain for me as much as it is for my customers. There is a banner at the very top of my homepage informing customers have VAT is added to all items at checkout so please do expect some added costs when completing your order.