@robertbrook it's automatically calculated, with shipping, when you order; the final confirmation page with payment instructions (also emailed to you) tells you.
yes so: 338 +15 shipping, becomes 353, multiply by 1.2 for VAT and you get a final total of £423.60
@robertbrook i should clarify that the VAT is only charged for shipping to UK. outside of the UK, 0% VAT is applied