They CANNOT in a regular employment contract UNLESS it can be justified that the job specifically needs it. Even when employer is justified, the rest entitlement still exists and must be compensated for, and the employer requires appropriate justification if they cannot give that compensatory rest. And if they put themselves in this situation (where employees go beyond normal working time limits), they need to keep good records of time they did make their employees work, so they can confirm they haven't broken the law to the HSE when it comes knocking.
They CANNOT in a regular employment contract UNLESS it can be justified that the job specifically needs it. Even when employer is justified, the rest entitlement still exists and must be compensated for, and the employer requires appropriate justification if they cannot give that compensatory rest. And if they put themselves in this situation (where employees go beyond normal working time limits), they need to keep good records of time they did make their employees work, so they can confirm they haven't broken the law to the HSE when it comes knocking.