"(2) In this section "relevant provision", in relation to a worker's contract, means a provision of the contract comprised - (a) in one or more written terms of the contract of which the employer has given the worker a copy on an occasion prior to the employer making the deduction in question, or (b) in one or more terms of the contract (whether express or implied and, if express, whether oral or in writing) the existence and effect, or combined effect, of which in relation to the worker the employer has notified to the worker in writing on such an occasion."
"(1) In this Part "wages", in relation to a worker, means any sums payable to the worker in connection with his employment, including -"
"(3) Where the total amount of wages paid on any occasion by an employer to a worker employed by him is less than the total amount of the wages properly payable by him to the worker on that occasion (after deductions), the amount of the deficiency shall be treated for the purposes of this Part as a deduction made by the employer from the worker's wages on that occasion."
"We find that there is an implied term incorporating the collective agreement into the contracts of employment of the applicants and other staff of the respondent arising from a custom and practice that has been going back for at least 20 years"
"The terms changed were automatically included in the applicants' contracts by virtue of the collective agreement."