D & C Builders v Rees [1965]

R delayed payment to D&C for several months, then
offered sum less than he owed.
Basically said: this or nothing.
D&C in desperate financial straits, so accepted.
D&C then sued for balance.
Lord Denning MR:
Not inequitable for D&C to go back on promise to
accept lesser sum – settlement not truly voluntary.
R therefore liable for balance.