What is the case law in English case Tsakiroglou v Noblee Thorl?

Tsakiroglou v Noblee Thorl is an English contract law case that dealt with the issue of frustration of contract. The case established that a supervening event which makes performance of a contract illegal will generally constitute frustration, so long as the illegality was not caused by the fault of either party. This case expanded the doctrine of frustration to include not only events that make performance physically impossible, but also events that make performance illegal.