“An employer shall not make a deduction from wages of a worker employed by him unless— (a) the deduction is required or authorised to be made by virtue of a statutory provision or a relevant provision of the worker’s contract, or (b) the worker has previously signified in writing his agreement or consent to the making of the deduction.”
“In this Act “worker” (except in the phrases “shop worker” and “betting 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; and any reference to a worker's contract shall be construed accordingly.”