I transited through Changi the evening of 16 Aug en-route to Sydney from London. I had purchased a packaged bottle of duty free alcohol (Irish single malt) at Heathrow Terminal 5 - showing boarding card as normal. The security check at Gate C1 took the duty free from me on the grounds that it was not packed in a sealed plastic bag - although the bottle clearly was sealed in a plastic/cardboard tube, and the whole contained in a London Airport normal branded plastic bag. Asking for a manager had no effect. Showing the Heathrow receipt had no effect. The bottle was a gift to my son in Sydney, and given that I'm a pensioner was a moderately expensive purchase on top of the rest of the trip. I asked what would happen to the bottle. The manager and operator were very evasive - and it was perfectly clear what was to happen to the bottle. I had thought that Singapore was an honest environment - but this was clearly a disappointing experience where no imagination or flexibility were provided at all. Be warned - I certainly won't make the mistake of trusting Changi security again.