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Using case law to discuss how does an offer differ from an invitation to treat, in your discussion use two common law cases to support your arguments and demonstrate the rules involved? Discuss the concepts in law in the cases given below as it relates to a valid contract. . Scammell v Ouston (1941) . Baird Textiles v Marks and Spencer (2001) . Tweddle v Atkinson (1861). . White v Bluett (1853) and Chappell & Company v Nestle Company Limited . Roscorla v Thomas (1842). . Stilk v Myrick ( 1809) and Collins v Godefroy ( 1831) . Williams v Roffey Brothers ( 1990) and Hartley v Ponsonby (1857)