Consideration?
Promise for something in return.
Bilateral - exchange of promises
Unilateral - promise in return for an act.
Adequate - some value (even nominal)
Sufficient - has to be proper (not love and affection etc..). performance of public duty not sufficient (unless exceeding that duty).
Past consideration
Contractual variations
Require all elemenets.
Consideration shortfall.
Must confer a benefit or suffer a detriment. (normally only one so no consideration).
If performing existing duty does not count. If exceeds this does.
Or if it confers a practical benefit (Williams v Rofey Bros & Nicholls 1991).
Promise to accept less
Agreement between creditor and debtor not binding on creditor.
Foakes v Beer - interest lower not binding.
Consideration must be sufficient but need not be adequate.
Provided a debtor gives something else in return for promise will be consideration.
Promissory estoppel
Creditor stopped if unfair to do so.
-made promise not to enforce legal rights
-someone relied on that promise
-estopped from enforcing legal rights.
Note
-Used as a defence
-Must have been promise to waive legal rights
-must have acted on promise
-can resume by reasonable notice (rent)
-Clean hands.