Lobster only said it's probably region-free, nothing about free shipping.
Total £32.27 incl. shipping to SG.
Reported is region free.
The list price of £32.99 includes VAT (value-added tax, UK's equivalent of our GST), which today is 15% (used to be 17.5% until the financial crisis). Shipments outside EU do not have to pay VAT, so this is removed, leaving £28.69 payable. Shipping is £2.09 per shipment plus £1.49 per item, for £3.58. Total is therefore £32.27, as Lobster said. Which ironically is cheaper than the free-shipping price to within UK since VAT is included.
You should note this in relation to Amazon.co.uk, which is one of the very few UK online retailers that takes the trouble to deduct VAT from its list price when the purchase is non-EU. Most websites don't bother and still charge it, some at least give you free worldwide shipping (which in reality you pay for out of the VAT they wrongly still charge), some add insult to injury and charge further for shipping.
(Please note, however, that books are VAT-free anyway in UK, so this does not apply to books -- the price you see is the price you still have to pay even though we're not in the EU.)
Nice find Lobster, I'm tempted to buy now...