Originally Posted by
carrotjuice
May be a bit late now for OP's trip, but for anyone who's thinking of buying from Duty Free at Changi on arrival from LHR - don't bother.
It's cheaper at World Duty Free at T5 (yes, even though technically there's no more duty free in UK). Particularly so at certain times of the year when WDF offers extra 10% discount for "reserve and collect" (your item is merely kept aside at the customer service counter, you'd pay only upon collection).
Unless you're connecting at Changi on any carrier to Australia, in which case any liquids over 100ml - including duty free sealed bags containing alcohol from other ports - will be confiscated at the gate check upon boarding your next flight. This includes re-boarding BA15 for the onward flight to SYD even if you arrived on it from LHR just 60-90 minutes earlier.