This is what they state
"We are pleased to announce that Singapore Airlines have increased the baggage allowance for tickets issued in the UK, on or after September 2013, for travel to Australia or new Zealand.... they then say.... standard economy allowance has increased from 20kg to 30kg, business 30 to 40 and suite 40 to 50......kindly note if you hold an unused/unstamped/not validated migrant visa that specifically states that you are permitted to remain in Australia indefinitely/permanently, you will then be entitled to the double baggage allowance. the double baggage allowance will only be granted when you check in at the airport when this visa is sighted and checked that it has also not been travelled on before, this has to be the first time it is being used"
so from that my understanding is that it would be 60kg flying economy as this is double the standard allowance???? I wonder if they will honour this statement!!!!????