Originally Posted by
carrotjuice
Shouldn't think so. Because LHR would've put your alcohol purchased in tamper-proof sealed bags, that SIN would just scan at the gate.
Australia has it's own rules. All liquids will be confiscated. You can buy at Changi duty free and they'll deliver it to you at the gate or you can buy on board your SIN-AUS flight. But you are paying Changi departing prices which I doubt are much different to T5 anyway