I see that the Avios finder is still playing games.

Trying to book a LHR-HKG/BKK-LHR open-jaw mixed class 241 next March (out in F, back in CW). The Avios finder showed 2 seats in CW back from BKK on March 27 so I phoned to book. Nope, no CW reward flights available for the whole of March; maybe they've gone now, but F is available. OK I'll just have to fly F both ways then (it's a hard life ). While she was typing away I checked again and they were still there (and still are an hour later). So I just tried to make a dummy LHR-BKK-LHR booking and, even though seats were showing both out (20/3) and return (27/3) on the Avios finder, the booking failed because no seats were available on either leg . Any idea what''s going on?