aeroplaneplane, info about private and executive flying seems to be a closely-guarded secret round here!!
I have noticed that many threads get started asking about it but there are zero or very few replies.
From my experience, I can only tell you that it is very hard to get into, jobs are rarely advertised and if you have no previous experience of this type of flying, then you can just about forget it.
If I knew of a way to succeed, I would gladly share it with you!!