"Where the reason or principal reason for the dismissal of an employee was that he was redundant, but it is shown that the circumstances constituting the redundancy applied equally to one or more other employees in the same undertaking who held positions similar to that held by him [and all that clearly applied here] and who have not been dismissed by the employer and -- (b) that he [the employee] was selected for dismissal in contravention of a customary arrangement or agreed procedure relating to redundancy [and the Tribunal found there was an agreed procedure] and there were no special reasons justifying a departure from that arrangement or procedure in his case,