If the promisee provides what he was required by public law to do in any event in return for a promise, promised performance of existing duty is not good consideration. In
Collins v Godefrey Godefrey promised to pay Collins for his giving of evidence. It was held that Collins could not enforce the promise as he was under a statutory duty to give evidence in any event. However, if the promisee provides more than what public duty imposes on him, then this is good consideration. In
Ward v Byham a mother was under a statutory duty to look after her child. The ex-husband promised to pay her £1 a week if she ensured that the child was well looked after and happy. It was held that notwithstanding the statutory duty imposed on the mother, she could enforce the promise since the act of keeping the baby 'happy' provided additional consideration. Promising to perform a pre-existing duty owed to one's contracting party also fails to make good consideration. However this rule has been considerably narrowed by recent case law. The general rule is that if a creditor promises to discharge a debt in return for a fraction of payment, in paying the agreed fraction, the promisee is not providing consideration for the promise, as this is merely part performance of a contractual duty already owed. Consequently, the debtor is still liable for the whole amount, as he cannot force the promisor to accept less. A leading example is in
Stilk v Myrick where Stilk, a seaman, agreed with Myrick to sail his boat to the
Baltic Sea and back for £5 per month. During the voyage, two men deserted. Myrick promised he would increase Stilk's wages if Stilk agreed to honour his contract in light of the desertions. Stilk agreed and on return to port, Myrick refused to pay him the extra wages. It was held that Myrick's fresh promise was not enforceable as the consideration Stilk had provided for it, the performance of a duty he already owed to Myrick under contract, was not good consideration for Myrick's promise to increase his wages. Initially, there were only two exceptions to this rule: •
Hanson v Royden, the promisee has done, or has promised to do, more than he was obliged to do under his contract. •
Hartley v Ponsonby before the fresh promise was made, circumstances had arisen which would have entitled the promisee to refuse to carry out his obligations under his contract.
Factual benefits However, the strictness of this rule was severely limited in
Williams v Roffey Bros & Nicholls (Contractors) Ltd. The Roffey Brothers entered into a contract to refurbish a block of flats for a fixed price of £20,000. They sub-contracted carpentry work to Williams. It became apparent that Williams was threatened by financial difficulties and would not be able to complete his work on time. This would have breached a term in the main contract, incurring a penalty. Roffey Brothers offered to pay Williams an additional £575 for each flat completed. Williams continued to work on this basis, but soon it became apparent that Roffey Brothers were not going to pay the additional money. He ceased work and sued Roffey Brothers for the extra money, for the eight flats he had completed after the promise of additional payment. The Court of Appeal held that Roffey Brothers must pay Williams the extra money, as they had enjoyed practical benefits from the promise they had made to Williams. The benefits they received from it include: Having the work completed on time, not having to spend money and time seeking another carpenter and not having to pay the penalty. In the circumstances, these benefits were sufficient to provide consideration for the promise made to Williams of additional payment. It now seems that the performance of an existing duty may constitute consideration for a new promise, in the circumstances where no duress or fraud are found and where the practical benefits are to the promisor. The performance of an existing contractual duty owed to the promisor is not good consideration for a fresh promise given by the promisor. However, performance of an existing contractual duty owed to a third party can be good consideration, see further below. According to the Court of Appeal, it is unlikely that either avoiding a breach of contract with a third party, avoiding the trouble and expense of engaging a third party to carry out work or avoiding a penalty clause in a third party contract will be a "practical benefit". In
Simon Container Machinery Ltd v Emba Machinery AB, the practical benefit was held to be the avoiding of a breach of contract, which was clearly not an extension of the principle. This is true unless the debtor provided fresh consideration for the promise. The following, mentioned in ''Pinnel's Case'', may amount to fresh consideration: • If the promisee offers part payment earlier than full payment was due, and this is of benefit to the creditor; • If the promisee offers part payment at a different place than where full payment was due, and this is of benefit to the creditor; or, • If the promisee pays the debt in part by another chattel (note, however, that part payment by cheque, where full payment was due by another means, is not consideration.) Another exception is that part payment of the debt by a third party as consideration for a promise to discharge the creditor from the full sum, prevents the creditor then suing the debtor for full payment (see
Welby v Drake). The Court of Appeal, in
Re Selectmove Ltd, stated that the
practical benefit doctrine, arising from
Williams v Roffey, in order to apply
Williams v Roffey (a
Court of Appeal decision). The Court of Appeal in June 2016 in
MWB v Rock Advertising revisited the issue of whether the
practical benefit doctrine could be applied to decreasing pacts or agreements to accept less. Arden LJ and Kitchin LJ both endorsed this approach indicating that part payment along with practical benefit
could be enough to support a promise to accept less. The decision has been criticised as extending the practical benefit test beyond its limits.
Existing duties to third parties Consideration for a promise can be the performance of a contractual duty owed to someone other than the promisor. In
Shadwell v Shadwell, Cayley Shadwell was under a contractual duty with a third party to marry. His uncle, Charles Shadwell promised to pay him £150 per year after he was married. It was held that Cayley Shadwell marrying was good consideration, notwithstanding that he was obliged by a contract with a third party to marry in any event. A promise to perform a pre-existing contractual duty owed to a third party (as opposed to the performance of that duty) may also amount to consideration. ==Estoppel==