EMPLOYMENT LAW - Casenotes - Clear medical evidence of disability required in "deduced effects" cases. Woodrup v London Borough of Southwark . Cause of impairment irrelevant to whether disability exists at material time. Power v Panasonic UK Ltd . Causation must be considered where employee chooses retirement over redundancy. Catherall v Michelin Tyre pk . Agency worker was an employee. Dacas v Brook Street Bureau (UK) and another . Tribunal must have regard to fairness when considering hypothetical dismissal. Panama v London Borough of Hackney . Evidence required to support specific characteristic of ethnic group. Bradford Hospitals NHS Trust v Al-Shabib