The Universe Sentinel [1983]

Unlawful threat by Trade Union to continue the ‘blacking’
of ship.
Held contract voidable for economic duress.
Juridical basis for duress set out by Lord Scarman:
Duress is not to do with vitiation of consent.
V still intends to contract, but contract is made
unwillingly.
Typically will be no other choice open to V.