In spite of being aware that I was renting out the property, [first company that sold me the property] never requested a registration/consent fee or information about the tenants. As such, the CONTRACT WAS VARIED BY [first company]'s CONDUCT. In addition, [second company that bought ground rent] also did not request this information, in spite of my address being different to the property address. Please note the following cases that support the variation of a contract by conduct, and the waiver of the right to rely on a written variation, inferred by conduct:
In Globe Motors Inc & others v TRW Lucas Varity Electric Steering Limited & another, the Court of Appeal clarified that even if an agreement contains a clause which provides that it can only be varied if the variation is in writing and is signed by all parties, the agreement can in fact be varied orally or by conduct. The Court of Appeal, Globe Motors, Inc and Others v TRW Lucas Varity Electric Steering Limited and Another (2016) EWCA 396 (decided on 20 April), confirmed the general principle in English contract law that parties have freedom to agree whatever terms they choose to undertake, and they can do so in a document, by word of mouth or by conduct. The fact that an agreement may include a clause requiring any variations to be in writing will not prevent parties from later making a new contract varying the contract by an oral agreement or by conduct. However, even where there is a no-variation clause, an oral variation or a variation by conduct could be effective where the evidence establishes - on the balance of probabilities - that the variation was agreed.
That position was then consolidated in a case later in 2016 between MWB Business Exchange Centres and Rock Advertising. Waiver is where one party voluntarily agrees to a request by the other not to insist on the precise performance method outlined in the contract. In these circumstances, it may be said that that party has waived its right to insist on performance in that particular way. A waiver can be oral or written, or can even be inferred by conduct - so a party can waive (or be taken to have waived) its right to rely on a written variation where the way it has acted after the contract has been varied by oral agreement.
In the recent case of Reveille Independent LLC v Anotech International (UK) Ltd [2015] EWHC 726 (Comm), the English Commercial Court has ruled that even where a contract clearly contains completion formality requirements, the conduct of the parties may amount to a waiver of those requirements and both acceptance of the offer and communication of acceptance.
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