As posted previously I will be affected by the change, and BA still haven't communicated formally to me. What they have done though is send me yet another survey asking about my experiences with BA, inc Exec Club - so I took the liberty of providing them very direct feedback on the change and the net outcome for me in my instance that it will result in less revenue.

Sounds like from the recent posts, that there are quite a few people in the same position that will be affected (>3k<5k in current year), and membership year ending in Jan or early Q1, so unreasonable to try and achieve in the compressed grace period given.