"certificate of authorisation" means a certificate issued under section 531(11);
"certificates of deduction" has the meaning assigned to it by section 531(6)(f);
"certified subcontractor", in relation to a principal, means a subcontractor - (a) in respect of whom the principal holds, at the time of making a payment under a relevant contract to the subcontractor, a relevant payments card for the year in which the payment is made, and (b) in respect of whom the principal has not received a notice under paragraph (a) of subsection (13) of section 531;
"chargeable period" has the same meaning as in section 321(2);
"construction operations" means operations of any of the following descriptions - (a) the construction, alteration, repair, extension, demolition or dismantling of buildings or structures, (b) the construction, alteration, repair, extension or demolition of any works forming, or to form, part of the land, including walls, roadworks, power lines,
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