Hyde v Wrench - W offered to sell farm for £1,200, H offered to pay £1,000, time passed for W to think about it, just before W said yes H offered £950, W said no to £950 and so H said he was happy to go back to the original £1,000, by that time W sold to someone else. Held, there was no contract as the £1,000 offer was vitiated when the £950 was proposed