A classified advertisement in a periodical is an invitation to treat, not an offer for sale — so placing an ad cannot constitute the criminal offence of 'offering for sale' under statute.

A payment of £1 is legally sufficient consideration to render an option to purchase land a binding, irrevocable offer. On exercise, specific performance lies for the contract of sale — not the option — making the adequacy of the option consideration irrelevant.

A warranty given after a horse sale was unenforceable because the completed purchase could not provide valid consideration for a new promise made after the fact.