Offer and acceptance

Dickenson v Dodds

Revocation can be made by a reliable third party

Hyde v Wrench

Counter offer destroys original offer

Felthouse v Bindley

Silence cannot constitute acceptance

Adams v Lindsell

Acceptance is complete on posting

Patridge v Crittenden

Advertisements are generally invitations to treat

PSGB v Boots

Display of goods on a shelf is an invitation to treat not an offer

Carlill v Carbolic Smoke Ball Co

If an advert is clear and firm it may be an offer

Routledge v Grant

Offer can be withdrawn at any time before acceptance

Article 2 of the E-Commerce regulations 2002

Website purchases are accepted upon being posted

Brinkibon

Messages left during office hours are effective when they are left, even if they aren't read or listened to.

Harvey v Facey

A request for information is not an offer

Entores v Miles Far East

instant messages must actually be received to be effective acceptance

Holwell v Hughes

The postal rule does not apply when the offeror asks for notice in writing as he clearly expects acceptance in writing in front of him.