Tried that on Aug 25. Having had no reply by Sep 8, I rang, to be told that they had replied by email on 3 Sep.

However, I didn't get any email reply from them on 3 Sep (I did get an EC statement by email - perhaps someone got confused), and they couldn't forward the 3 Sep email to me - just copy and paste the contents into a new email.

I sorted this out over the phone. After 20 minutes of having to hold, listening to stuff about "It is our job as Customer Relations to ensure that you want to fly with BA again". After the wait and the following conversation, I was a lot less inclined to fly with BA again. I'm still in correspondence with them, and yes, Customer Relations is not covering itself in glory so far.