Originally Posted by
Hartington
What FLIGHT NUMBER were you booked on?
What flight number ARE you booked on?
Have the numbers changed in either direction?
The OP's first post suggests it's only the aircraft type that has changed, in which case it's presumably BA280 (outbound), which is the only currently operating flight on the route.
It's been typically operated by a B789 in recent years, but was a B744 last winter and was presumably planned to be an A380 for W20, pre-COVID. So, albeit that it's now going to remain a B789, BA could argue that the flight is still operating.