(1) In this Act -

"cash" means cash that is legal tender;

"contract of employment" means - (a) a contract of service or of apprenticeship, and (b) any other contract whereby an individual agrees with another person to do or perform personally any work or service for a third person (whether or not the third person is a party to the contract) whose status by virtue of the contract is not that of a client or customer of any profession or business undertaking carried on by the individual, and the person who is liable to pay the wages of the individual in respect of the work or service shall be deemed for the purposes of this Act to be his employer, whether the contract is express or implied and if express, whether it is oral or in writing;

"contract worker" has the meaning assigned to it in section 4F;