Where in consequence of listed building consent being revoked or modified by an order under Part II of Schedule 11 to this Act, compensation is payable by virtue of section 172 of this Act in respect of expenditure incurred in carrying out any works to the building in respect of which the consent was granted, then if a listed building purchase notice is served in respect of an interest in the land, any compensation payable in respect of the acquisition of that interest in pursuance of the notice shall be reduced by an amount equal to the value of the works in respect of which compensation is payable by virtue of that section.