If you book this out of LHR on SQ, I'd recommend that you take a flight on the 777 as opposed to the A380. The J seat is considerably better.
Having flown BA F in 1K and SQ J in 11A within 2 weeks of eachother, I have to say I would take the latter over the former in a heartbeat.
Although, if you're short of miles why not fly from AMS? only 60k per person o/w - 15% for booking online, plus you pay less taxes and fees.