As a datapoint, I've been looking for the past few days for travel LHR-HKG-LHR in F on BAEC and Asia Miles for a return ticket this weekend.
Nothing until today (Thursday) when I found availability going out Friday or Saturday, and returning Sunday on Asia Miles. Still nothing on BAEC online. I picked a specific flight pair from Asia Miles, called up BAEC, and five minutes later I was booked.