Originally Posted by
1Aturnleft
If you click on the refund link within the page provided it clearly specifies the scenarios in which a refund is appropriate. An aircraft change isn't listed as a valid reason for claiming a refund.
I deliberately made sure my 1 Jan flight to JFK was in the 'new' F on the 777-300. Plane switched the the 777-200 and 'old' F. As it's still F, you cannot claim a refund based on a different style of seat. It's still F (or J) in BA's eyes.