The formal process outlined in the employee handbook for staff to raise concerns or complaints.
If an employee sues you, the WRC will ask: "Did they use the grievance procedure?" If you don't have one, or didn't follow it, your defence is weak. It is the safety valve that stops internal arguments becoming lawsuits.
Generally, no. Under the Code of Practice on Grievance and Disciplinary Procedures, an employee has the right to be accompanied by a work colleague or a trade union representative. They do not have a statutory right to bring a solicitor or family member to internal meetings, unless there are exceptional circumstances (e.g., potential criminal charges involved).
Absolutely not. Ignoring a formal grievance is a procedural failure that will count against you in the WRC. Even if the complaint seems frivolous, you must acknowledge it and follow the steps outlined in your Employee Handbook (investigation, hearing, outcome). Failing to hear the grievance denies the employee their right to fair procedure and can lead to a Constructive Dismissal claim.