http://www.legislation.gov.uk/uksi/2008/1521/article/2/madeThe Finance Act 2007, Section 17(2) (Corporation Tax Deduction for Expenditure on Energy-Saving Items) (Appointed Day) Order 2008Corporation taxTaxEnergy conservationenKing's Printer of Acts of Parliament2011-07-04CORPORATION TAX This Order appoints 8th July 2008 as the day on or after which the amendment made by section 17(1) of the Finance Act 2007 (c.11) shall have effect in relation to expenditure incurred. 2 The day appointed for the purposes of section 17(2) of the Finance Act 2007 is 8th July 2008.