"1 That the Contractor having had an opportunity of inspecting our Conditions of Contract shall be deemed to have noted its provisions and hereby agrees to be bound by them insofar as they are applicable to his subcontract. 6 LABOUR In respect of all operatives employed by the Contractor, the Contractor is responsible for and shall keep the Company indemnified against any claim or liability for National Insurance, Graduated Pension Contributions, Pay-As-You-Earn, Holiday Pay, Construction Industry Training Board levy, Travelling Expenses and other emoluments payable, all other payments required by Law or otherwise which may be necessary for the proper execution of the contract work whether current or introduced during the period of the contract. The Contractor must at all times provide sufficient labour to maintain the rate of progress laid down from time to time by the Company, and shall supply such labour with all necessary tools and equipment. On each site where the work is in progress the Contractor must maintain a competent foreman or chargehand who has complete control of all labour engaged on the work. Any instruction given to such foreman or chargehand shall be deemed to have been given to the Contractor. 20/21 SUBLETTING No order, nor any part order issued by the Company shall be assigned, sublet or transferred without the prior consent in writing of the Company. In the event of any such assignment, subletting or transfer, the Contractor shall be responsible for securing compliance with these conditions in every respect."
" 'worker' means an individual who has entered into or works under (or, where the employment has ceased, worked under) - (a) a contract of employment; or (b) any other contract, whether express or implied and (if it is express) whether oral or in writing, 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 profession or business undertaking carried on by the individual."
"employment under a contract of service ... or a contract personally to execute any work or labour."