"In the light of the findings of fact made by the Tribunal, and the facts as evidenced by undisputed evidence and documents generated or tendered by the Respondent, the Tribunal erred in law in failing to determine, properly and by reference to those facts and that evidence, and making any necessary inferences, that the reason or principal reason for the dismissal of the appellant was that he had asserted his statutory right to be permitted time off for the performance of his public duties; alternatively the Tribunal's finding to the contrary was perverse."