Which contract type is characterized by irregular working hours?

The zero hours contract is characterized by irregular working hours, which is a key aspect that distinguishes it from other contract types. In a zero hours contract, the employer does not guarantee any minimum number of hours of work, meaning that employees may be called in to work as needed, with their hours varying significantly from week to week or month to month. This arrangement provides flexibility for both the employee and the employer but can lead to unpredictability in income and job stability for the employee.

In contrast, full-time and part-time contracts typically involve a set number of hours per week. Full-time employees usually have a consistent schedule and guaranteed hours, while part-time employees have a predetermined but fewer number of hours. Freelance contracts may also involve varying hours, but they usually allow for more control over when and how much work is taken on, rather than the unpredictable nature of a zero hours contract. Therefore, among the options given, the zero hours contract is the most accurate answer regarding irregular working hours.