Sunday Trading Act 1994

14 If—

(a) under the contract of employment under which a shop worker who satisfies the conditions in paragraph 2(2)(a) and (b) above was employed on the day before the commencement date, the employer is, or may be, required to provide him with shop work for a specified number of hours each week,

(b) under that contract, the shop worker was or might have been required to work on Sunday before the commencement date, and

(c) the shop worker has done shop work on Sunday in that employment (whether or not before the commencement date) but has, on or after the commencement date, ceased to do so,

then, so long as the shop worker remains a protected shop worker, that contract shall not be regarded as requiring the employer to provide him with shop work on weekdays in excess of the hours normally worked by the shop worker on weekdays before he ceased to do shop work on Sunday.