... later finds that Sarah has now accepted a well paid job and now wishes to recover the additional £20. Although Laura did accept the travellers cheques she can still sue for the additional £20 now that Sarah has a well paid job, because Sarah is doing no more than her contractual duty, part payment of an existing debt is not good consideration, so with out this all that is left is Laura's promise not to sue for the additional money and a person can go back on a promise. This can be seen in the case of D&C Builders V Rees (1966) When Mr and Mrs Rees would only pay £550 to builders who had done some work for them instead of the agreed £732. They had taken advantage of the builder's financial problems as they knew they would have to accept the lesser amount or face bankruptcy. The court ...

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