What can I do as an employer if employees are known to be breaking the National Lockdown rules?

This will depend on the particular facts and the employee’s circumstances but an employee should co-operate with the employer so far as is necessary to enable compliance with any statutory duty or requirement relating to health and safety.

In addition, conduct outside of work can result in an employee’s dismissal if the conduct pertains to the employment relationship. If an employee breaches the lockdown rules and it affects their ability to work, such as it being no longer safe for them to attend work, or the reputation of the employer, these may be grounds for disciplinary action and subsequent dismissal.