"Since the tribunal expressly found that the claimant could be removed from the rota for health and safety reasons, the only issue in the case is whether or not there were such reasons. The tribunal has found that there were and has attributed to the respondent a reasonable discretion to remove him until the matter, which was his certification, was satisfactorily resolved. That being the primary finding of the tribunal, it must follow that it was not a deduction unlawfully made from the claimant's contract for him to be removed from the rota. Removal from the rota takes with it removal from the right to be paid. Put simply, if he was not liable to be sent out and did not actually do any work, he could not claim the payments akin to overtime; and similarly if he did not make himself available in his spare time to be called upon, if so required, then that payment would not be made. The logical conclusion from that simple finding by the tribunal is at the heart of this case and means that there was no breach of the claimant's contract."