I am sorry for bumping this post up again but the situation remained the same. I have written a letter to CX about this issue. I hope CX can take the lead to deal with the situation as BA simply pushed the ball to CX, saying they are the ones controlling availability.
For mobile users the CX block is on all its routes, including HKG-LHR and so on.
If BA is a person then I would have slapped her on the face
(Just kidding!)
I will twitter and phone bomb BA tomorrow and see what is up now (won't spam but will probably have a big rant as I have now lost all flexibility with Avios in Asia)