A sexual offence investigation in the UK typically involves several stages: an initial allegation, police enquiries, an interview under caution, ongoing evidence gathering, and a charging decision by the Crown Prosecution Service. If charged, the case proceeds to court.
Being accused of a sexual offence is a serious and often overwhelming experience. Many people have little or no prior contact with the criminal justice system, and uncertainty about what happens next can add to the stress.
This guide explains, step by step, how a sexual offence investigation typically unfolds in England and Wales, and what you can expect at each stage.
Step 1: Initial Allegation
A sexual offence investigation begins when a complaint is made to the police. This may happen immediately after an alleged incident, or sometimes months or years later. The person making the complaint is referred to as the complainant, they or a person on their behalf may report the offence via 101, 999 or online. Third parties may make the complaint on their behalf, this could be a friend, teacher, or medical professional.
The police will usually:
- Take a detailed statement from the complainant
- Consider any available medical or forensic evidence
- Assess whether further enquiries are required
At this stage, the person accused may not yet be aware that an allegation has been made and can therefore be contacted by the police following a considerable amount of investigative enquiries having already been made.
Step 2: Initial Police Enquiries
Before contacting a suspect, police often carry out early evidence gathering. This can include:
- Speaking to potential witnesses
- Reviewing messages, emails, and social media
- Securing CCTV or other recordings
These early steps help sexual offence investigators understand the circumstances before deciding how to proceed. They also allow investigating officers to prepare for interviewing the accused, often putting them on the front foot. How to ensure you are aware of all information prior to interview is to instruct legal representation early, at Eventum Legal we will always aim to correspond with investigating officers prior to attendance at the police station.
Step 3: Arrest or Voluntary Interview
If the police decide to speak with you, this will usually take place either by arrest or by a voluntary interview under caution.
Arrest
You may be taken to a police station and held for questioning.
If you are arrested the police are likely to bail you with conditions, and with a date and time to attend back at the police station.
Voluntary interview
You may be invited to attend a police station at a pre-arranged time.
Even if described as “voluntary,” the interview is still conducted under caution. This means what you say can be used as evidence.
You are entitled to free and independent legal advice before and during questioning.
Step 4: The Police Interview Explained
During the interview:
- The allegation will be put to you
- You will have an opportunity to respond
- Your legal representative can advise you throughout
Interviews are a key stage in any investigation. The approach taken can vary depending on the circumstances, which is why legal advice at this point is important.
Step 5: What Happens After the Interview?
After the interview, several outcomes are possible:
Released Under Investigation (RUI)
You are released while enquiries continue, without a fixed return date.
Police Bail
You are released with conditions, which may include restrictions on contact or movement, and a date to return to the police station.
Charge & Remand
If the evidence is strong and the offence is particularly serious, the police may consider remanding the accused into custody to appear before the Magistrates Court as soon as possible. Bail will be considered by the court.
Further enquiries
In some cases, the police may need additional time to gather evidence before making a decision.
Investigations involving digital evidence—such as mobile phones or computers—can take several months or longer. Forensic examination of electronic devices is often required in sexual offence cases particularly those concerning indecent images, sexual communication with a child, sexual assault, rape and threatening to disclose private sexual photos.
Step 6: The Ongoing Investigation
At this stage, the police continue building the case. This may involve:
- Analysing phones and digital devices
- Taking further witness statements
- Obtaining expert or forensic evidence
- Conducting additional interviews if necessary
This period can be lengthy and is often the most uncertain part of the process. The police have a duty to investigate lines of enquiry that point towards and away from the accused, therefore, if you want the police to consider evidence which may assist your defence, then you must discuss that with a lawyer as early as possible, we can consider your case and defence evidence, apply that to the circumstances and the allegations and advise on the best way forwards.
Step 7: Referral to the Crown Prosecution Service
Once the police have gathered sufficient evidence, the case is referred to the Crown Prosecution Service.
The CPS applies a two-stage test:
- Evidential stage: Is there a realistic prospect of conviction?
- Public interest stage: Is it appropriate to bring a prosecution?
Both stages must be satisfied for a charge to be authorised.
Step 8: Charging Decision
Following review, the CPS may decide to:
- Take no further action (NFA)
- Authorise a charge
If no further action is taken, the investigation ends.
If a charge is authorised, the case moves into the court system.
Step 9: Court Proceedings
Serious sexual offence cases are usually dealt with in the Crown Court.
The process generally includes:
- An initial hearing in the Magistrates’ Court
- Transfer to the Crown Court
- A plea hearing
- A trial, if a not guilty plea is entered
At trial, both the prosecution and defence present evidence, and a jury will decide the outcome.
Possible Outcomes of a Sexual Offence Investigation
A case may conclude in several ways:
- No further action (before charge)
- Discontinuance after charge
- Not guilty verdict if the case proceeds to trial
- Conviction
Each outcome carries different legal consequences.
Why Early Legal Advice Is Important
The early stages of a sexual offence investigation—particularly the police interview—can significantly influence how a case develops.
Obtaining advice from a specialist legal team at an early stage can help you:
- Understand your rights
- Make informed decisions
- Navigate the process more effectively
- Avoid where possible unnecessary charges
Final Thoughts
A sexual offence investigation in the UK is often complex and can take time to resolve. Understanding the process can help reduce uncertainty and allow you to approach each stage with greater clarity. We always say to our clients that our role is to deal with the legal aspects of your case whilst you focus on the emotional and mental toll false allegations have on you and those immediate family members who are also affected.
If you have been asked to attend a police interview or believe you may be under investigation, seeking legal advice as early as possible is strongly recommended.