(1) Section 843 of the Principal Act is amended -

(a) in subsection (1), in the definition of "qualifying period" by substituting "31 December 2006 or, where subsection (1A) applies, ending on 31 July 2008" for "31 July 2006",

(b) by inserting the following after subsection (1):

"(1A) This subsection shall apply in relation to the construction of a qualifying premises where -

(a) the person who is constructing the qualifying premises has, on or before 31 December 2006, carried out work to the value of not less than 15 per cent of the actual construction costs of the qualifying premises, and

(b) the person referred to in paragraph (a) or, where the qualifying premises is sold by that person, the person who is claiming a deduction under Part 9 in relation to the expenditure incurred, can show that the condition in paragraph (a) was satisfied.",

and

(c) in subsection (2), by substituting "Subject to subsections (2A) to (7) and (as inserted by the Finance Act 2006) sections 270(4), 270(5), 270(6) and 316(2B)" for "Subject to subsections (2A) to (7)".