Ezsias v North Glamorgan NHS Trust [2007] EWCA Civ 330, [2007] IRLR 603
It would only be in an exceptional case that an application to an employment tribunal will be struck out as having no reasonable prospect of success when the central facts are in dispute.
An example might be where the facts sought to be established by the applicant were totally and inexplicably inconsistent with the undisputed contemporaneous documentation.