My mother is flying on the 321 in Y tonight. Thought I might at least treat her to a bit of pre-flight pampering if it were possible. I have no status with SQ directly, and guessing that all my VS miles and AU status there won't cut any ice either...
Not sure about SQ, but if it's Terminal 3 there's the excellent No1 Traveller lounge.
http://www.no1traveller.com/heathrow-ai ... inal-3.htm