doctrine of frustration
due to a subsequnet change of circumstances, the contract is rendered impossible to perform, or it has become deprived of it’s commercial purpose by an event
significance
by impossibility - destruction of the subject matter
Taylor v Caldwell - it is impossible for the contract to take place due to the hall unexpectedly being burnt down
unavailability of the subject matter
The neema - 7 voyages were planned between april and december but due to strikes took longer than expected
delays and interruption
does not always amount to frustration - a building job taking longer and costing more than expected