"Sir Hugh Griffiths said in Maris v Rotherham Corporation that the concept 'brings into consideration all the circumstances surrounding the dismissal requiring the tribunal to take a broad commonsense view of the situation and to decide what, if any, part, the applicant's own conduct played in contributing to his dismissal and then in the light of that finding decide what, if any, reduction should be made in the assessment of this loss.' The onus lies on the employer to prove that the employee contributed to his dismissal by conduct which is "culpable or blameworthy" and unreasonable in the circumstances."
"Once a causal link has been established, the amount of deduction is at large for the tribunal. ... The EAT will generally not intervene in a tribunal's finding of contributory fault, still less in the amount of the deduction. In Hollier & Plysu Ltd 1983 the Court of Appeal advised Industrial Tribunals to take a broad commonsense view. It was a matter of 'impression, opinion and discretion'."
"Reinstatement is an order that the employer shall treat the complainant in all respects as if he had not been dismissed and must include benefits payable in respect of the period since dismissal and rights and privileges, including seniority and pensions. [Statutory references are then given.] It should not be ordered if it is 'not practicable' for the employer to comply with it or it would be unjust to do so because the employee contributed to the dismissal. ... The matter is one pre-eminently for the tribunal's independent discretion and appeals are only reluctantly entertained."