
First of all forget about vPost when you order from amazon.co.uk. When you use vPost with them then you've lost the plot at the very start, because by delivering to a local address in the UK you are charged the full price for the items that you see on-screen (which include VAT - which is another way of phrasing GST).
If you order from .co.uk directly to Singapore, then the VAT savings (it will be deducted from the final price for the order) will virtually always be greater than the delivery costs, so at the end of the day you get the products delivered here cheaper than UK residents get them with their free delivery.
