Is there a limit to how many coaches or umpires we can send on courses during the year?

We intend to implement a fair use policy where we will reserve the right to restrict access to clubs or individuals that either regularly do not show up or significantly over index in terms of the number of candidates they are sending on courses. We are planning to cater for 5 times the capacity of coaching candidates for example and plan to evolve our delivery model to be as effective as possible. Realistically initially there may be some waiting lists or delays getting on courses but we expect these to be short term issues.