I received the following message from Betfair today:
The Singaporean government recently began to take steps against foreign operators accepting bets from customers residing in Singapore. When the new regulation comes into force Singaporean residents will be prohibited from gambling with operators that don't hold local licences. For this reason we have decided to stop accepting bets from customers based in Singapore as of December 15th, 2014.
Singaporean citizens who reside abroad can continue to use our services.
All customers affected by this change have already been informed regarding this by e-mail - please see the communication & FAQ’s attached.