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.