SOWAH v. BANK FOR HOUSING AND CONSTRUCTION AND ANOTHER Contract—Building contract—Parol contract—Breach—Parol contract collateral to deed of contract valid—S (contractor) and T executing a building contract—Subsequent parol contract adding extra works to construction—Later contract between BHC, T and S requiring prior approval of BHC before any variation of contract drawings—S performing works demanded by earlier parol contract—Whether failure by BHC and T to pay for extra works constituting breach of contract—Contracts Act, 1960 (Act 25), s.11.