Schedule 17 to this Act (first-year allowances in respect of expenditure on energy-saving plant and machinery) has effect—
(a)for income tax purposes, as respects allowances and charges falling to be made for chargeable periods ending on or after 6th April 2001, and
(b)for corporation tax purposes, as respects allowances and charges falling to be made for chargeable periods ending on or after 1st April 2001.