It is very rare for a contract to be held to have been frustrated by an event that leaves it possible to perform, but which simply makes it much more onerous to one party. This is illustrated by Davis Contractors v Fareham UDC. Consequently, it is accepted that it is unlikely that a contract will be frustrated merely because an event has occurred which renders that contracted for by one party worth less than he anticipated or where an unexpected event merely makes the contract more expensive to perform.