I have lots of students who have flexi schooling arrangements if they are excelling in a field - I have had students who are in Formula Ford, GB Level Water Polo, Netball, Basketball also lots of students who are in youth football teams who have one day training a week.
We are a sports college so probably why we have such a high level of this occuring, teachers have to provide work to keep them up to date.
Lots of our past students have gone on to do well - olymipians, current GB squads, top league football teams.
As EatShit Derek says its a partnership and if we have any concerns they are raised very quickly.