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 tax 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.

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 refer specifically to value added tax or this section.

References in this section to a change in the tax charged on a supply include references to a change to or from no tax being charged on the supply F3(including a change attributable to the making of an election under paragraph 2 of Schedule 6A to this Act).