It is a legal requirement that your employer provides you with a Statement of Terms and Conditions of Employment within two months of you becoming their employee. Amongst other things, this must include details of their disciplinary and grievance procedures and how decisions can be appealed.
The main purpose of the grievance procedure is to give employees the opportunity to raise issues about their working relationship or their working environment. If a fair grievance procedure is not followed, this could affect your performance and your workplace relationships. It could also have a detrimental effect on your wellbeing.
Once a grievance had been raised, your employer has to follow a fair process in investigating and addressing it. If they don’t, then there could be a breach of the implied term of mutual trust and confidence between the employer and you, perhaps entitling you to claim constructive dismissal claim in the employment tribunal.