s 89 Adjustments of contracts on changes in VAT.
(1) Where, after the making of a contract for the supply of goods or services and before the goods or services are supplied, there is a change in the VAT charged on the supply, then, unless the contract otherwise provided, there shall be added to or deducted from the consideration for the supply an amount equal to the change. (2) Subsection (1) above shall apply in relation to a tenancy or lease as it applies in relation to a contract except that a term of a tenancy or lease shall not be taken to provide that the rule contained in that subsection is not to apply in the case of the tenancy or lease if the term does not specifically to VAT or this section. (3) References in this section to a change in the VAT charged on a supply include references to a change to or from no VAT being charged on the supply (including a change attributable to the making of an option to tax any land under Part 1 of Schedule 10 ).