Michaela,
That's good advice, but remember that the employment contract, deed or agreement may include clauses that would never normally be invoked. To my mind it should cover all worse case scenarios. It is not uncommon to find clauses in employment contracts which may only be enforceable in the most extreme circumstances, but it doesn't hurt to have them in there.
Regardless of what the contract says, in a dispute over termination it would ultimately be decided by a court whether the termination was legal.
Polly, are you wanting a restraint clause as well?
Maisy.
Edit/PS: You wouldn't want to say "If you
repeatedly refuse to carry out a lawful and reasonable direction" you may be terminated, because that suggests that there is some level of refusal to carry out duties that is acceptable