Originally Posted by
megaloman
In fact, I had a similar scenario - I've booked a First class redemption for HKG-SIN, then my flight got changed for three class A330, so I got downgraded. I've spotted this thanks to the
myflightsapp. I called BA and an agent asked if I wanted to get the avios difference or change for another flight. I chose another flight on a same day.
If change of equipment happened way before the departure, BA EC should see it on the e-tix and will refund you the difference in avios.
You should have received difference in fare, a 1 way space available upgrade and if into economy at least 1 if not 2 seats beside you blocked. Just my experience on a few occasions