Well, my wife copied my complaint across, made a few minor edits, and submitted it to BA via the same web page. She has just received a reply. There is a qualified apology and compensation for my daughter's one sector downgrade in the form BA credits to the value of AUD 81.71 each. I find it hard to envisage even the sum of those credits being sufficient for any one sector upgrade, anywhere, and yet that is exactly what it is supposed to compensate for. I also doubt very much that they will have need to fly with BA ex Brisbane within 12 months, so unless the credits can be used directly for Qantas bookings they still have zero value.