“The general principle derived from Felthouse v Bindley and applied by the Court of Appeal in Allied Marine Transport Ltd v Vale de Rio Doce Navegacao SA (The Leonidas D)[1985] 1 WLR 925 at 927, 937 and the House of Lords in Vitol SA v Norelf Ltd [1996] CLC 1159 at 1165;[1996] AC 800 at 812 is that acceptance of an offer cannot be inferred from silence, except in exceptional circumstances.” 76. Exceptional circumstances are considered in Chitty on Contracts (31 st edition, 2012) at [2-072] which states: … there may be exceptions to the general rule that an offeree is not bound by silence. If the offer has been solicited by the offeree, the argument that he should not be put to the trouble of rejecting it loses much of its force, especially if the offer is made on a form provided by the offeree and that form stipulates that silence may amount to acceptance. Again, if there is a course of dealing between the parties, the offeror may be led to suppose that silence amounts to acceptance: e.g. where his offers to buy goods have in the past been accepted as a matter of course by the despatch of the goods in question. In such a case it may not be unreasonable to impose on the offeree an obligation to give notice of his rejection of the offer, especially if the offeror, in reliance on his belief that the goods would be delivered in the usual way, had forborne from seeking an alternative supply. It has been held that one party's wrongful repudiation of a contract may be accepted by the other party's failure to take such further steps in the performance of that contract as he would have been expected to take, if he were treating the contract as still in force; and similar reasoning might be applied in the present context. There may also be “an express undertaking or implied obligation to speak” arising out of the course of negotiations between the parties, e.g. “where the offeree himself indicates that an offer is to be taken as accepted if he does not indicate the contrary by an ascertainable time.”
“… as the Commission of the European Communities explains in its written observations, is to alleviate the difficulties connected with determining the tax base and the amount of VAT deductible and to avoid an increase in the cost of consumer credit.”