nux - thank you. And there was me, blissfully unaware of the information you have so kindly provided.
Unless I have a serious amount of luggage to check in when flying J (as BAEC Gold, BA allows me 4x32kg = 128kg v QR 40kg+20kg = 60kg) even more reason for me to fly QR! ^
Saltire74 - sorry to learn that you won't be visiting CAI anymore. I'm sure you'll miss BA's ex-LHR T1 departures/arrivals.