Well yes,
If you think you can "pretend" to be BA, dont do it!
I have lots of close friends that have worked for GB, and were very disallusioned by it.
Try mainline BA, or even the charters in October to get you started off.
Its not a back door route to BA, in fact its the opposite if anything.
The franchise agreement is in plave until 2008, and apparently then its unsure to wether it will continue.
Then you will work for "Cadogan Airways" or whatever they are called independently.
Does it sound so appealing now?!