no one has no contract and everyone has to do so the defence of no contract is a non starter for the company doing what it pleases
All employees have an employment contract with their employer. A contract is an agreement that sets out an employee’s:
employment conditions
rights
responsibilities
duties
These are called the ‘terms’ of the contract.
Employees and employers must stick to a contract until it ends (eg by an employer or employee giving notice or an employee being dismissed) or until the terms are changed (usually by agreement between the employee and employer).
If a person has an agreement to do some work for someone (like paint their house), this isn’t an employment contract but a ‘contract to provide services’.
Accepting a contract
As soon as someone accepts a job offer they have a contract with their employer. An employment contract doesn’t have to be written down.
Its highly unlikely they can change hours without discussion and we are into the realms of constructive dismissal as it will most likely be covered a substantive change to terms and conditions of employment
Has anyone else been affected – do they do a specific job or are there others in similar roles? If yes to the later than why have only they had hours reduced etc