Originally Posted by
Boraxo
though as noted above the BA MFU is from Economy to World Plus, so you'd have to buy a higher priced World Plus ticket in order to do MFU to business.
Everything you say is spot on.
Though I will I add that I found E+ on BA to be a nice product. I am 73 inches tall and found it quite comfy on a LHR-JNB flight. Clearly not J, but much better than an exit row on any carrier.