Ambassador, British Airways; FlyerTalk Posting Legend
Join Date: Apr 2012
Location: Leeds, UK
Programs: BA GGL/CCR, GfL, HH Diamond
Posts: 42,918
when you go in to BA MMB you should see a bar at the top which says revert to old design. when you do that you should be able to look at the flight and click on more information for the pop up which shows selling class.
unfortunately selling class is not shown in the new design.