Offer and acceptance

• Displays in shop windows are invitations to treat and not offers

  Fisher V bell
• Displays in shops are invitations and not offers

  Boots
• Advertisements are invitations and not offers to sell

  Partridge v crittenden
• Unilateral Contract 

  Carlille v Carbolic smoke bomb
• Requests for further information and the answer are not offer and acceptance

  Harvey V Facey
• counter offer

  Hyde v Wrench. 
• lapse of time

  Ramsgate Hotel v Montefiore.
• Revocation

  Routledge v Grant. 
• Revocation by a third party

  Dickinson v Dodds
• offeror can specify a method of acceptance, but if this is simply advice rather than an instruction

  Yates v pulleyn
• silence or inactivity is not acceptance

  Felthouse v Bindley
• a letter of acceptance is effective when it is posted not received

   Adams v Lindsell
• If party specially says they must recieve the letter this may override the postal rule

  Howell v Hughes
• Instant messages must actually be received to be effective acceptance

  Entores
•  website advertisements are an invitation to treat as the terms are not clear enough to be bound by

  Article 11 (e-ccomerce regs 2002)