Bit late on this as ever as I don't check the forum as often as I used to but yes:
Current BA livery by Newell & Sorrell uses the proprietary font "Mylius"
The previous one by Landor used "Optima"
The red tail livery by Negus & Negus, I forget the exact name, but I was able to match it perfectly (i.e. identify it) by scanning an old BA sticker from that era and running the image through "http://whatthefont.com"'s font analysis program. Incidentally, many font download sites allow you to type some test text into a box and display it on screen. Hence a quick use of hte print screen button and then appropriate colour adjustment in a photo editing program might help you.