"6 The Company agrees: (d) Members of the Bricklaying Gang will be determined by the said Gang and the Company will have no right to interfere with the makeup of the Gang or with the split of payment determined by the Gang. (e) If the said gang wish to bring in additional or/and substitute workers to complete the task, the Company will have no right to prevent this."
"an individual who as entered into or works under (or where the employment has ceased, worked under) (a) a contract of employment or (b) any other contract … whereby the individual undertakes to do or perform personally any work or services for another party to the contract whose status is not by virtue of the contract that of a client or customer of any professional business undertaking carried on by the individual and any reference to a worker's contract shall be construed accordingly."