This has been the bone of contention for many of us right from the start of the athlete contract issue. No problems with contracts, but a lot of problem in UKA being able to dictate who coaches whom. Particularly in retrospect when so many have fallen by the way side or failed to improve or compete well.
It could all have been done properly and carefully, but it wasn't.
I have been an advocate of the 'seamless pathway for coach and athlete' since ever...... That way you can take the personal coach along and educate and train where necessary, without creating the huge animosity of pushing him or her to one side.