Just tried to do a UUA for zone 2 peak. The avios price being quoted by BA is no longer 7500, but 9500 PP. { Old prices in still in force when I did a UUA on the 24th April. }
From a spreadsheet I have it looks like they are using the difference between the Avios required on the 50p RFS fares in ET & CE. { Which equates to a 2k Avios increase across the board for Zones 1-3. }
Looks like the charts in post
#7 on this thread might need updating.