Do You Have to Give Notice for an Investigation Meeting in the UK?

If a concern crops up about conduct, capability or a workplace incident, your first step is usually to investigate. That often involves inviting employees to an investigation meeting.

But do you have to give notice for an investigation meeting? How much notice is “reasonable”? And what should your invite actually include to keep things fair, prompt and legally sound?

In this guide, we’ll walk through your obligations under UK law and the Acas Code of Practice, what good practice looks like in real life, and the common pitfalls that trip up small businesses. With the right process, you can run fair investigations, protect your business and keep matters moving without unnecessary delay.

What Is An Investigation Meeting And When Should You Hold One?

An investigation meeting is a fact-finding conversation. You’re gathering information to decide whether there’s a case to answer and, if so, whether to move to a formal disciplinary or capability process.

Typical triggers include complaints, potential misconduct, performance concerns, safeguarding issues, near-miss incidents, or information security breaches. The purpose is not to decide guilt or impose sanctions-it’s to understand what happened.

Investigation meetings can be held with the employee at the centre of the issue and with witnesses. Depending on the complexity, you may run a single meeting or several. Keeping a clear record of what you did and why you did it is key, so take notes and store them securely.

If you’re at the start of a process, it’s worth revisiting your procedures and the workplace investigations steps to ensure you’re aligned with the Acas Code of Practice on disciplinary and grievance procedures.

Do You Have To Give Notice For An Investigation Meeting?

There’s no statute that sets a fixed notice period for an investigatory meeting. However, you must act “reasonably” and follow fair procedures. The Acas Code expects employers to deal with issues promptly and to inform employees of the concerns so they can respond. In practice, that means giving the person enough notice to attend and a basic understanding of the issue you want to discuss.

Key points to keep in mind:

• There’s no legal minimum notice period, but “reasonable” notice is required as part of a fair process.
• Make clear the meeting is investigatory and not a disciplinary hearing. You’re gathering facts, not making findings.
• If the meeting could lead immediately to disciplinary action (for example, if you plan to present evidence and move straight to a sanction), stop-this should be scheduled as a separate disciplinary hearing with full rights and disclosure.
• If the employee is vulnerable or needs adjustments (e.g., for a disability or language support), build that into your timing and arrangements.

Bottom line: while there’s no hard-and-fast rule, adequate notice is part of ensuring the process is fair and defensible. Rushing someone in with no context increases the risk of grievances or an unfair dismissal finding later.

How Much Notice Is Reasonable For An Investigation Meeting?

“Reasonable” depends on the context. For most straightforward matters, 24–48 hours’ written notice is usually fair. For more complex issues (technical allegations, multiple incidents, safeguarding concerns), you might allow more time so the employee can gather their thoughts and any relevant information.

Consider these factors when setting your timeframe:

• Complexity and volume of issues you’re exploring.
• Availability of the employee and any representative you’re permitting.
• Whether any adjustments are needed (e.g., an interpreter, a support person for mental health reasons).
• Urgency and business needs-balanced against fairness. If there’s a live risk (e.g., serious data breach) you may need to meet sooner, but still offer meaningful notice.

If the matter is urgent and you need to act immediately, you can still hold a brief, initial discussion with limited notice to secure facts, then offer a follow-up investigation meeting with more notice. Document why urgency was justified.

What Should The Notice Include?

Your invitation letter or email sets the tone and helps you demonstrate fairness. Keep it clear, neutral and factual. It should usually cover:

• Purpose: that this is an investigatory meeting under your procedures, not a disciplinary hearing.
• Scope: a brief description of the concerns or incident you’ll be discussing (avoid prejudgment or loaded wording).
• Time, date, place: offer a reasonable time slot and location (or video call details), with a contact if rescheduling is needed.
• Who will attend: typically the investigator and a note-taker. Explain that the employee should not record the meeting without consent.
• Accompaniment: clarify your policy on companions at investigatory meetings (see below), including reasonable adjustments.
• Confidentiality: ask the employee not to discuss the investigation beyond those who need to know.
• Documents: if you plan to refer to key documents or data during the meeting, say so-and share them where proportionate.
• Next steps: explain that after the investigation you’ll decide whether any further action is required, which could include a separate disciplinary hearing.

Be consistent with your policies. If you have a disciplinary or investigation procedure in your Staff Handbook or Employment Contract, align your wording with those documents.

Can The Employee Bring Someone To An Investigation Meeting?

There’s a statutory right to be accompanied at a disciplinary or grievance hearing under the Employment Relations Act 1999. That right does not automatically extend to investigatory meetings.

However, Acas guidance suggests it can be reasonable to allow a companion at the investigatory stage in some circumstances-particularly where the employee may struggle to participate without support, requires a reasonable adjustment, or where your policy allows accompaniment.

Practical approach for small businesses:

• State your default position (e.g., companions are not usually required at investigatory meetings) but confirm you’ll consider requests case-by-case.
• If you do allow a companion, limit the role to observation and support-they shouldn’t answer questions on the employee’s behalf.
• If a companion’s availability would cause a long delay, offer an alternative date within a few days. Don’t let the process stall.

Importantly, if you move to a formal disciplinary hearing, the statutory right to be accompanied will apply, and you’ll need to provide the evidence you’re relying on before that hearing.

What About Witnesses-Do They Need Notice Too?

Yes. Witnesses should be notified in a way that protects confidentiality and minimises disruption. For internal witnesses, short notice (same day or next day) may be reasonable if the matter is simple. External witnesses may need more flexibility.

Your witness invite should explain:

• That you’re conducting a workplace investigation and you’d like their account.
• Time, date, location and who will attend.
• Confidentiality expectations and data protection basics (their statement will be stored and may be shared where necessary).
• They can review and sign their statement, and the importance of accuracy.

Protect data throughout. Witness statements and notes will likely contain personal data, so store them securely and comply with UK GDPR/Data Protection Act 2018.

Should You Share Evidence Before An Investigation Meeting?

For investigation meetings, there’s no strict duty to disclose all evidence in advance. However, it’s good practice to share any key documents you intend to put to the employee so they can respond meaningfully. This might include an extract of an email, a policy they’re alleged to have breached, or a short chronology.

Full disclosure is required later if you proceed to a disciplinary hearing. At that point, you must provide the employee with the evidence you rely on with enough time for them to prepare. If your potential outcome could be a final written warning or even summary dismissal, the fairness of your disclosure and timing will be scrutinised.

When Is Suspension Appropriate Before An Investigation?

Sometimes you may need to suspend an employee while you investigate-typically in cases involving serious allegations, risks to people or property, or where evidence could be compromised. Suspension should be a last resort, on full pay, kept as short as possible and regularly reviewed.

Make clear in writing that the suspension is a neutral act and does not imply guilt. Poorly managed suspensions can breach the implied term of trust and confidence, increasing legal risk. For a deeper dive into when and how to suspend, see employee suspension best practice.

Managing Notes, Recordings And Confidentiality

Take a clear, factual note of each meeting. Confirm whether audio recording is permitted-many employers prohibit covert recordings and instead offer to share typed notes for agreement. Ask participants not to record without permission.

Data protection matters too. Your notes will include personal data and potentially special category data. Limit access to those who need to know, store securely, and set retention periods that align with your policies. If your process involves vetting or checks, review the do’s and don’ts in our guide to background checks.

Common Mistakes When Notifying Employees About Investigation Meetings

Small businesses often get the basics right but slip up on the details. Avoid these pitfalls:

• Insufficient notice with no good reason, leaving the employee unable to attend or prepare even basic points.
• Vague invites that don’t explain the general subject matter-causing confusion and undermining fairness.
• Mixing investigatory and disciplinary steps in one meeting, then imposing a penalty without proper disclosure or the right to be accompanied.
• Allowing undue delays (e.g., waiting weeks for a preferred companion) when a timely alternative is reasonable.
• Inconsistent treatment-departing from your policy without justification.
• Failing to consider reasonable adjustments for disability or other needs.
• Using prejudgment language in invites that suggests an outcome is already decided.

If allegations could amount to gross misconduct, pay special attention to procedure. Investigation quality and fairness often determine whether a dismissal is defensible.

Practical Template: What Your Invite Might Say

Here’s a structure you can adapt to your template or letter:

• Subject: Invitation to Investigation Meeting
• Opening: We’re looking into . This meeting is part of our fact-finding and is not a disciplinary hearing.
• Details: Time, date, location/video link, who will attend.
• Scope: We’ll ask about .
• Documents: We may refer to . Copies enclosed/attached where relevant.
• Accompaniment: Our policy does/does not allow a companion at investigatory meetings. If you require adjustments, please let us know.
• Confidentiality: Please keep this process confidential.
• Next steps: After the investigation, we’ll decide whether any further action is needed, which could include a separate disciplinary hearing.
• Contact: Who to contact to reschedule or ask questions.

Keep the tone professional and neutral. Don’t include commentary about potential sanctions, and don’t imply conclusions.

Policies, Contracts And Training To Put You On The Front Foot

Fair investigations are easier when your paperwork is in order from day one. Make sure your core documents are up to date and consistent:

• Contracts and handbooks: Clear conduct standards, disciplinary procedures, confidentiality rules and investigation steps in your Employment Contract and Staff Handbook.
• Policies: Data protection, acceptable use, CCTV/monitoring, and social media policies that explain what you collect and how you use it.
• Investigation playbook: Internal guide for managers covering invites, questions, note-taking, witness handling and escalation.
• Training: Short modules for line managers on the Acas Code, reasonable adjustments and how to run meetings fairly.

If your investigation leads to formal action, follow your disciplinary process carefully. Where outcomes might involve a warning or dismissal, check your approach against guidance on final written warnings and, for very serious cases, summary dismissal.

Frequently Asked Questions From Employers

Do I Have To Share All Evidence Before The Investigation Meeting?

No, not all evidence is required at the investigatory stage. Share key items you plan to discuss if it helps the employee respond meaningfully. If you progress to a disciplinary hearing, you must disclose the evidence you rely on in good time.

Can I Proceed If The Employee Refuses To Attend?

Yes, provided you’ve offered reasonable notice and alternatives (e.g., another time, written questions, or a remote meeting). Document the refusal and continue your fact-finding. Don’t delay indefinitely.

What If We Discover New Allegations Mid-Process?

Pause and consider scope. It’s usually better to inform the employee of the new points and, if necessary, hold a further investigatory meeting so they can address them. Avoid rolling new allegations into a disciplinary hearing without investigation.

Can I Combine The Investigation And Disciplinary Hearing?

It’s safer to keep them separate. If you decide to move to a disciplinary hearing, send a fresh invite, provide the evidence, and make clear the right to be accompanied. Combining stages often leads to procedural unfairness.

How Thorough Does The Investigation Need To Be?

It needs to be as thorough as is reasonable in the circumstances. Gather relevant evidence, speak to key witnesses and keep an open mind. A skim investigation can undermine outcomes-especially where dismissal is on the table.

Key Takeaways

• There’s no fixed legal notice period for investigation meetings, but you must give reasonable notice and enough information for the employee to understand the broad issues.
• Make clear the meeting is investigatory, not disciplinary. If you move to a disciplinary hearing, apply the statutory right to be accompanied and disclose the evidence you rely on.
• 24–48 hours’ notice is often reasonable for straightforward matters; allow more time for complex cases or where adjustments are needed.
• Your invite should cover purpose, scope, logistics, attendees, accompaniment, confidentiality and what happens next-use neutral, non-prejudgmental language.
• Handle witness meetings with similar care: clear notice, confidentiality and accurate statements stored securely in line with data protection law.
• Get your foundations in place-clear procedures in your Staff Handbook and Employment Contract make investigations faster, fairer and more defensible.
• Where allegations may be serious (potential gross misconduct), pressure-test your process against best practice for gross misconduct and keep investigatory and disciplinary stages distinct.

If you’d like help drafting investigation invites, updating your disciplinary procedure, or sense-checking a tricky case, you can reach us for a free, no-obligations chat on 08081347754 or at team@sprintlaw.co.uk.