(a) It does not matter, because the terms of a contract can be partly oral and partly written, and in such cases the courts will admit evidence of both written and orally agreed terms. Van den Esschert v Chapell will likely be followed in the present circumstances.
(b) It does matter, because if the written terms of a contract appear to be all those needed for a workable transaction, the court will not allow evidence of additional orally agreed terms. LG Thorne v Thomas Borthwick will most likely be followed in the present circumstances.
(c) It does not matter as long as the orally expressed terms in question are reasonable and fair, and provided that they do not contradict any expressly agreed terms. BP Refinery (Westernport) Pty Ltd v Shire of Hastings will most likely be followed in the present circumstances.
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