Mark,
It doesn't answer your question directly, but if you go to
http://www.avnclub.demon.co.uk/index.htm
and click on "BA Fleet (summary by Aircraft type)" it will give you a list of all the aircraft and their current livery 'status'. There's also a "Latest Fleet News" section with details of the aircraft about to be repainted, and a gallery with all the different tails in.
Hope this helps
Cheers
Landing_24R