BA have reliably operated into Singapore for months, so it was a little curious that they suspended passenger traffic on this route as the restrictions on the Singapore side meant that there wasn't any "non essential" travel going on anyway. I guess they really wanted to furlough absolutely as many people as possible. They're still running and carrying cargo, I've got my OH's coral reef and marine fish booked on BA12F on Monday!

I would have a strong suspicion that they'll restart passenger carrying as I personally know of people who are booked on the flights imminently for a longer Xmas trip back to the UK to justify having to do 2 weeks quarantine on return

Looking at the Maldives thread it seemed like redemption bookings were managing to get booked on QR (maybe with a bit of HUACA) otherwise the SQ flights are running reliably so worst case you can get a refund and book there (not sure BA would rebook in advance to SQ)