Or do what I did last month - LHR-SIN-PER-SIN-LHR in a weekend :-)
I looked at various other options:
* MAN-LHR-AMS or MAN-LHR-PAR (only bookable on fully-flexible IATA YY fare)
* LHR-FRA-SIN-FRA-LHR
But the PER flight was only about £50 more than SIN or PAR - and yielded far more SC / points.
Though after 48h in Y I now have to invest in a chiropractor