PB
The other prompt for this little mini diatribe was reading that BA will go all T7 on LHR-HKG , one of my regular routes .
I think your information is incorrect.
1. The daily BA25/26 flights are scheduled to remain on the B744
2. The daily BA27/28 flights are scheduled to go to the B773
3. The trice weekly BA31/32 flights are scheduled for the B772