In Bull v Pitney Bowes Ltd [1966] 2 All ER 384 HC, the High Court held that clauses in restraint of trade are void unless the employer can show that they are no more than is required to protect its interests, but even then, if the employee can show that the clause is contrary to the public interest, it remains void and unenforceable.
In Swain v West (Butchers) Ltd [1936] 3 All ER 261 CA, the Court of Appeal held that the employer was entitled to ask an employee about colleagues' misconduct and that these were lawful questions that the employee must answer.
In The Ottoman Bank v Chakarian [1930] AC 277 JCPC, the Judicial Committee of the Privy Council held that an employee can refuse to transfer to a geographical area where the employee would be at personal risk.
In Devonald v Rosser & Sons [1906] 2 KB 728 CA, the Court of Appeal held that there was an implied term in a piece rate worker's contract that the employer would provide him with a reasonable amount of work.