Being investigated for, or charged with, conspiracy to supply drugs is a serious matter and often a confusing one, particularly for people who were never caught in possession of drugs or who never personally handed anything to anyone. That confusion is understandable. Conspiracy charges work differently from a straightforward supply offence, and the law allows the prosecution to bring them even where no drugs were physically seized or exchanged. At Harewood Law, we have extensive experience defending these cases.
These cases frequently involve multiple defendants, large volumes of evidence, and material such as phone data, call records, financial transactions and surveillance gathered over extended police investigations. The potential sentence can be substantial, particularly where the allegation involves conspiracy to supply Class A drugs such as cocaine or heroin.
What is conspiracy to supply drugs?
Conspiracy to supply drugs is charged under section 1 of the Criminal Law Act 1977, combined with the underlying drug offence under the Misuse of Drugs Act 1971.
A conspiracy exists where two or more people agree to pursue a course of conduct that, if carried out, would amount to supplying a controlled drug.
To secure a conviction, the prosecution must establish:
- An agreement between two or more people to supply, or be concerned in the supply of, a controlled drug
- Intention on the part of the defendant that the agreement be carried out
- Sufficient evidence linking the defendant to that agreement. This does not require proof that drugs were ever physically supplied, seized, or even that the full quantity alleged actually existed
Conspiracy vs. a Substantive Supply Offence
A substantive supply charge requires the prosecution to prove a specific act of supply, a particular transaction, a particular quantity, a particular recipient. A conspiracy charge instead requires proof of an agreement.
This distinction matters in practice: it’s often easier for the prosecution to establish that an agreement existed (through messages, patterns of contact, or financial evidence) than to prove the details of individual transactions. It also means conspiracy charges are frequently used to prosecute an entire network or operation together, rather than isolating single incidents.
Conspiracy to supply Class A,B,C drugs
Controlled drugs in the UK are classified as A, B or C under the Misuse of Drugs Act 1971, with Class A treated as the most serious category due to the harm associated with these substances.
| Class | Examples |
| Class A | Heroin, cocaine, crack cocaine, ecstasy (MDMA), LSD, methamphetamine |
| Class B | Cannabis, ketamine, amphetamines, codeine |
| Class C | Anabolic steroids, certain benzodiazepines |
Conspiracy to supply drugs sentencing guidelines
Sentencing for conspiracy to supply drugs follows the Sentencing Council’s guideline for supplying (or offering to supply) a controlled drug, applied within the framework for conspiracy offences under section 1 of the Criminal Law Act 1977. There is no fixed conspiracy to supply drugs sentences. The court works through a structured, two stage process for every individual defendant, which is why codefendants in the same case can receive very different outcomes.
Step 1a: Assessing culpability
The court first determines which of three roles best describes the defendant’s involvement:
Leading role: Directing or organising supply on a commercial scale; substantial links to and influence over others in the chain; close links to the original source; expectation of substantial financial advantage; use of a business as cover; abuse of a position of trust.
Significant role: An operational or management function within the chain; involving others through pressure, influence or reward; expectation of significant financial advantage; some awareness of the scale of the operation.
Lesser role: A limited function performed under direction; involvement through pressure, coercion, grooming or exploitation; little or no influence over others; little awareness of the operation’s scale; limited or no financial advantage.
No single characteristic is determinative: The court weighs the circumstances as a whole.
Step 1b: Assessing harm
Harm is assessed primarily by drug quantity, split into four categories (Category 1 being the largest scale, Category 4 the smallest). For Class A drugs (heroin/cocaine), the indicative quantities are:
| Harm Category | Indicative Quantity |
| Category 1 | 5kg |
| Category 2 | 1kg |
| Category 3 | 150g |
| Category 4 | 5g |
Where the allegation involves direct supply to users, including street dealing, the case is treated as at least Category 3 regardless of quantity, with adjustment within that category. In conspiracy cases, harm can be assessed against the quantity intended or agreed between conspirators, not only drugs physically recovered.
Step 2: Starting points and category ranges
Once role and harm are established, the court applies the relevant table. For Class A supply offences:
| Harm Category | Role | Starting Point | Category Range |
| 1 | Leading | 14 years | 12–16 years |
| 1 | Significant | 10 years | 9–12 years |
| 1 | Lesser | 7 years | 6–9 years |
| 2 | Leading | 11 years | 9–13 years |
| 2 | Significant | 8 years | 6y6m–10 years |
| 2 | Lesser | 5 years | 3y6m–7 years |
| 3 | Leading | 8y6m | 6y6m–10 years |
| 3 | Significant | 4y6m | 3y6m–7 years |
| 3 | Lesser | 3 years | 2–4y6m |
| 4 | Leading | 5y6m | 4y6m–7y6m |
| 4 | Significant | 3y6m | 2–5 years |
| 4 | Lesser | 18 months | High level community order 3 years |
For the largest commercial operations, sentences of 20 years or more can be appropriate depending on role. The starting point is adjusted up or down within the range once aggravating and mitigating factors are applied..
Aggravating factors may include:
- Relevant previous convictions
- Using someone under 18 to deliver drugs
- Supplying near school premises
- Exploiting children or vulnerable people
- Supplying to someone under 18
- Controlling another’s home for drug activity
- Targeting premises where children/vulnerable people are present
- Creating additional risk of serious harm
- Concealing or disposing of evidence
- Weapons or violence not separately charged
- Breaching current court orders
- Supply into prison
- Sophisticated methods to evade detection
The court avoids double counting factors already reflected in the role or harm assessment.
Mitigating factors may include:
- Pressure or intimidation falling short of duress
- Supplying only the drug to which the offender is addicted
- Genuine mistaken belief about drug type
- An isolated incident
- No previous, or no relevant/recent, convictions
- Genuine remorse
- Positive character or conduct
- Steps taken to address addiction
- Serious medical conditions
- Age or immaturity, particularly for young adults
- Mental disorder or learning disability
- Sole/primary carer responsibilities
- Difficult or deprived background where vulnerability was exploited
- Prospects of work, training or education
What sentence can you get for conspiracy to supply drugs?
Typical sentence ranges by class and role include:
- Leading role, Category 1, Class A: Sentences typically fall between 12 and 16 years, with a 14 year starting point. This applies to those alleged to have organised or directed a substantial operation.
- Significant role, Category 2, Class A: Sentences typically range from 6 years 6 months to 10 years, with an 8 year starting point.
- Lesser role, Category 3 or 4, Class A: Sentences can range from a high level community order up to around 4 years 6 months, depending on category and individual circumstances.
For example:
Someone alleged to have organised the importation and distribution of several kilograms of cocaine, with links to the source supplier and expectation of significant profit, would likely be assessed as leading role, Category 1, exposing them to a starting point of 14 years.
Someone alleged to have acted as a courier on a small number of occasions, under direction, with no influence over others, may be assessed as a lesser role, Category 3 or 4, a materially different starting point.
Suspended Sentences
Sentencing reforms effective 22 March 2026 introduced a statutory presumption that custodial terms of 12 months or less will be suspended, unless a specified exception applies. For terms between 12 months and three years, suspension remains at the court’s discretion, weighed against rehabilitation prospects, risk of reoffending, and personal mitigation.
Given the seriousness typically attached to Class A conspiracy cases, immediate custody remains the likely outcome at Category 1 and 2 levels, while suspension becomes a realistic possibility at the lower end of Category 3 and 4, particularly for defendants with a lesser role and strong personal mitigation.
Seeking legal representation for conspiracy to supply drugs
If you are under investigation for, or have been charged with, conspiracy to supply drugs, the decisions you make now can significantly affect the outcome of your case. Harewood Law‘s criminal defence solicitors have experience representing clients in serious Crown Court drug conspiracy cases, and are available to provide confidential advice from the point of police station interview through to trial.
