Ah, that explains a lot. I didn't see any BA flights in our booking tool, tried again and they were there but when trying to book got the message that they were no longer available. Called our corp travel centre and they told me that the flight was wide open but they couldn't book it either. Apparently they managed to get me on the waitlist (is that a different system or did they just tell me rubbish)

Luckily I checked in for tomorrows flight this morning when they system was still working (10 o'clock)