7If under section 22(2) of the Finance Act 1963 income tax is chargeable on any amount, as being a premium the payment of which is deemed to be required by the lease, the person so chargeable shall be treated for the purposes of the computation of any gain accruing to him on a disposal of the lease as having incurred at the time the lease was granted expenditure of that amount (in addition to any other expenditure) attributable to the asset under paragraph 4(1)(b) of Schedule 6 to this Act.