5 Workplace Investigation Myths Every UK Employer Should Know

Think workplace investigations are straightforward? These five common myths could leave your business exposed to unnecessary legal, financial and reputational risk.

When an employee raises a grievance, allegations of misconduct arise, or concerns are raised about bullying, harassment or whistleblowing, employers are often under pressure to act quickly.

How an organisation responds in those first few days can have a significant impact on the outcome. A well-conducted workplace investigation helps establish the facts, supports fair decision-making and demonstrates that employees have been treated with respect and impartiality.

Unfortunately, there are still many misconceptions about what a workplace investigation involves and when an employer should appoint an external workplace investigator.

Having spent more than 20 yearsin senior HR roles and advising organisations through complex people issues, I've seen these myths lead to avoidable mistakes time and again.

Here are five of the most common.

Myth 1: External workplace investigators are only needed for serious cases

Many employers assume they only need an external workplace investigator when allegations are particularly serious or likely to result in legal proceedings.

In reality, the need for an independent workplace investigation is often driven less by the seriousness of the allegation and more by the need for impartiality.

For example, an external investigator may be the right choice where:

• the complaint involves a senior leader or director

• the business owner is personally involved

• HR is the subject of the complaint

• there is a conflict of interest within the management team

• the organisation is too small for genuine independence

• managers have limited experience of conducting investigations

• employees have already expressed concerns about impartiality

  
  

In these situations, asking an internal manager to investigate can create unnecessary doubt about the fairness of the process, even where that manager acts entirely appropriately.

An independent workplace investigator brings objectivity and credibility. They have no prior involvement, no internal relationships to manage and no vested interest in the outcome.

That independence can increase confidence in the process for everyone involved.

Myth 2: The investigator decides whether someone should be dismissed

This is probably the most common misunderstanding.

The investigator's role is not to determine guilt or decide disciplinary sanctions.

Instead, the investigator's role is to:

• identify the issues to be investigated

• gather relevant evidence

• interview witnesses

• review documentation

• assess the reliability of evidence

• establish findings of fact

• produce an objective investigation report

  
  

The employer then considers that report before deciding whether:

• there is no disciplinary case to answer

• informal action is appropriate

• a disciplinary hearing should take place

• further investigation is required

Similarly for grievace investigations, there should always be an internal hearing to consider the investigation report findings and determine the final outcome.

Keeping the investigation separate from disciplinary and grievance decision-making is an important safeguard. It helps ensure fairness and demonstrates that conclusions have been reached objectively rather than with a predetermined outcome in mind.

Myth 3: A workplace investigation has to prove exactly what happened

Employers are sometimes frustrated when an investigation cannot provide absolute certainty.

The reality is that workplace investigations are rarely able to establish every fact beyond doubt.

Unlike criminal proceedings, workplace investigations are generally concerned with establishing what is more likely than not to have happened based on the available evidence.

An experienced investigator will consider:

• witness evidence

• documentary evidence

• emails and messages

• policies and procedures

• chronology

• consistency of accounts

• corroborating evidence

  
  

Sometimes the evidence points clearly in one direction.

Sometimes it doesn't.

A good investigation doesn't manufacture certainty where none exists. Instead, it explains the evidence available, identifies where accounts differ and provides balanced findings supported by the evidence.

That enables the employer to make informed decisions with confidence.

Myth 4: Every grievance requires a formal workplace investigation

Not every workplace issue needs a lengthy formal investigation.

In fact, one of the most important decisions an employer makes is whether a formal investigation is needed at all.

Many issues are better resolved through:

• informal conversations

• facilitated discussions

• mediation

• management intervention

• coaching managers to have effective conversations

• clarification of expectations

  
  

Starting a formal investigation unnecessarily can increase conflict, damage working relationships and consume significant management time.

Equally, failing to investigate where a formal process is required can expose the organisation to employment tribunal claims or criticism that concerns were not taken seriously.

The right approach depends on the nature of the allegation, the available evidence and the potential consequences.

Taking advice early can often help employers choose the most appropriate route.

Myth 5: Anyone can conduct a workplace investigation

Being a good manager does not automatically make someone a good investigator.

Effective workplace investigations require a particular combination of skills, including:

• interviewing witnesses effectively

• evaluating conflicting evidence

• recognising bias

• maintaining procedural fairness

• producing balanced investigation reports

• understanding employment law principles

• applying organisational policies consistently

  
  

It is also important that investigators understand the distinction between gathering evidence and reaching disciplinary conclusions.

Poorly conducted investigations can create problems even where the eventual decision would otherwise have been reasonable.

A weak investigation report may:

• overlook important evidence

• ask leading questions during investigation interviews

• make unsupported assumptions

• reach conclusions that are not supported by the evidence

• undermine the employer's position if challenged

  
  

Investing in the quality of the investigation process is often one of the best ways to reduce future legal and employee relations risk.

What does a good workplace investigation look like?

Every investigation is different, but a robust process will typically include:

1. Defining the scope

Understanding exactly what allegations need to be investigated and what falls outside the scope.

2. Planning the investigation

Identifying relevant witnesses, documents and evidence before interviews begin.

3. Gathering evidence

Collecting relevant documentation, emails, policies, meeting notes and other material.

4. Conducting witness interviews

Speaking to those directly involved in an objective and consistent manner.

5. Assessing the evidence

Considering all available information without making assumptions or seeking evidence to support a predetermined conclusion.

6. Producing an investigation report

Setting out the evidence considered, factual findings and conclusions reached.

The investigation report should help the employer understand what happened, where evidence supports particular findings and whether there are matters requiring further consideration.

Common mistakes employers make during workplace investigations

Many investigation problems arise long before interviews even begin.

Some of the most common mistakes include:

• deciding what happened before gathering evidence

• appointing someone with a conflict of interest

• failing to define the allegations properly

• interviewing witnesses inconsistently

• asking leading questions

• failing to keep adequate records

• allowing unnecessary delays

• confusing facts with opinion

• failing to consider all relevant evidence

• producing reports that lack clear reasoning

  
  

These issues can undermine confidence in the process and make it more difficult for employers to defend subsequent decisions.

When should you appoint an external workplace investigator?

Every organisation is different, but appointing an independent investigator is often worth considering where:

• allegations involve directors or senior leaders

• there is a significant conflict of interest

• internal relationships make impartiality difficult

• the business lacks investigation expertise

• the matter is particularly sensitive

• multiple employees are involved

• the investigation is likely to be scrutinised by lawyers, regulators or an Employment Tribunal

  
  

An external investigator can also reduce pressure on senior managers, allowing them to focus on running the business while ensuring the investigation receives the attention it deserves.

Following the Acas Code of Practice

Although every workplace investigation is different, employers should ensure that disciplinary and grievance investigations are consistent with the principles set out in the Acas Code of Practice on Disciplinary and Grievance Procedures.

The Code emphasises the importance of carrying out necessary investigations before decisions are made, acting consistently, dealing with matters promptly and giving employees a fair opportunity to respond.

Employment Tribunals can take the Acas Code into account when considering whether an employer has acted reasonably, making it an important framework for organisations to follow.

Final thoughts

A workplace investigation is far more than a procedural exercise.

Done well, it helps employers make fair decisions, protects employee confidence and reduces organisational risk.

Done badly, it can undermine an otherwise defensible decision and damage trust across the organisation.

Whether you're dealing with a grievance, disciplinary matter, bullying allegation, whistleblowing concern or another complex employee relations issue, investing time in a fair and well-planned investigation is rarely time wasted.

If you're unsure whether a formal workplace investigation is needed, or whether an external workplace investigator would be appropriate, taking advice at the outset can often prevent small issues becoming much larger ones later.

Need a second opinion?

One of the questions I'm asked most often isn't "Can you investigate this?" It's "Do we actually need a formal investigation?"

In many cases, the answer isn't straightforward. Sometimes an informal approach or mediation is more appropriate. Other times, bringing in an independent investigator from the outset can protect both the organisation and everyone involved.

If you're facing a difficult employee relations issue and you're unsure of the right approach, I'd be happy to have an initial confidential conversation. Even if the conclusion is that you don't need an external investigator, you'll leave with greater clarity on your options.

Contact Vela People to discuss your situation in confidence.

Rosamund@velapeople.com