Thanks for the infor guys.

Actually I'm on SQ319 too, on 19 May. I would have preferred the later flight on SQ321 as I don't like to start drinking in the lounge too early and I can manage to get some sleep on the later flight. SQ321 is already sold out and the ticket price for SQ319 has gone up so I'm guessing it's nearing capacity too. My dreams of a half empty flight are disintegrating fast. Only had it twice on the SQ LHR - SIN route and once was a few months after SARS struck.