Conspiracy to supply Class B drugs is a serious criminal offence under the law in England and Wales and can lead to a significant custodial sentence. In many cases, individuals only begin to understand the implications once they are arrested, interviewed by the police or formally charged. At that stage, the consequences can include restrictions on your liberty, the seizure of devices or property and the risk of a lengthy prison sentence.

There is often confusion around what “conspiracy” means in this context. Many people assume it only applies where large-scale drug supply is clearly established, but the law can apply more broadly. You do not need to have physically supplied drugs to be charged - depending on the evidence, involvement in an agreement or plan to supply can be enough.

In this guide, the criminal defence solicitors at Tyler Hoffman explain how conspiracy to supply Class B drugs is defined, the sentencing guidelines the courts apply and the factors that can affect the outcome. We also outline what happens during an investigation and how early legal advice will protect your position.

What does the law consider a Conspiracy to Supply Class B Drugs Offence?

A charge of conspiracy to supply is fundamentally different from a simple possession or supply charge. The core of this criminal offence is the agreement. Under Criminal Law Act 1977 and the Misuse of Drugs Act 1971, a conspiracy is formed the moment two or more people agree to commit a crime.

This means the prosecution does not need to prove that a drug deal actually happened. They only need to prove, beyond a reasonable doubt, that there was a "meeting of minds" to supply a controlled drug. This agreement can be inferred from communications, actions or other circumstantial evidence. Even preparatory actions can lead to criminal charges for conspiracy to supply. This is a critical distinction that makes these cases complex and requires a strategic legal defence from solicitors with experience defending conspiracy charges.

What are class B drugs?

The Misuse of Drugs Act 1971 categorises controlled drugs into three classes: Class A, Class B, and Class C. Class B drugs include:

• Cannabis
• Amphetamines (also known as speed)
• Ketamine
• Codeine
• Spice (synthetic cannabinoids)

While the penalties for the supply of Class B drugs are less severe than those for Class A drugs like cocaine or heroin, they are still substantial. The legal system treats any involvement in the supply chain of a controlled drug, regardless of class, as a very serious offence. The sentences for conspiracy to supply Class B drugs can result in substantial sentences and have long-term consequences for your ability to travel overseas, employment prospects and personal life.

How sentences are determined

When sentencing someone for a conspiracy to supply class B drugs charge, Judges must follow the detailed Drug Offences Definitive Guideline issued by the Sentencing Council. The final sentence is determined by assessing the defendant's role in the conspiracy, and the quantity of the drugs involved.

Step 1: determining culpability

The court will first assess the defendant’s level of involvement in the conspiracy to supply. This is referred to as culpability and is central for determining the starting point for a sentence.

There are three main categories:

• Leading role: applies to individuals who are directing or organising the supply on a commercial scale. It may include those with control over others in the operation, close involvement with the source of supply or an expectation of significant financial gain.
• Significant role: typically covers those with an operational or management function within the supply chain. It can include individuals who coordinate activity, manage couriers or “runners”, or play a key role in distribution, often with a financial motive beyond personal use.
• Lesser role: this is where involvement is limited. It may include those acting under direction, such as couriers or “runners”, or individuals who have been coerced, pressured or exploited. It can also apply where there is limited awareness of the scale of the wider operation.

Establishing the correct level of culpability is critical. A drug defence solicitor will examine the evidence closely and challenge any suggestion that you played a more significant role than the facts support. This will have a direct impact on the starting point for sentencing and the overall outcome of the case.

Step 2: determining harm

The second step is to determine the level of harm, which is directly linked to the quantity of the Class B drugs involved in the conspiracy to supply. The guidelines set out four categories of harm:

Once the court has determined the offender's role (Leading, Significant or Lesser) and the harm category (1, 2, 3, or 4), the judge uses a sentencing grid to find the starting point and range for the sentence:

Once the court has assessed both culpability (role) and harm (quantity), it will use this framework to identify a starting point and sentencing range.

A person found to have played a leading role in a large-scale conspiracy is likely to face a substantial custodial sentence. By contrast, where involvement is limited and the quantity is lower, the court may consider a suspended sentence or a community order.

For that reason, establishing a lower level of culpability and harm category is critical to a successful drug conspiracy defence. The team at Tyler Hoffman will scrutinise the evidence collected, including how the quantity of drug has been calculated, to establish where the prosecution has overstated your role and challenge those assumptions directly.

Other significant penalties and consequences

A conviction for conspiracy to supply class B drugs carries consequences that extend beyond the primary sentence. Following a conviction for drug offences that have generated a financial benefit, the prosecution will almost certainly commence confiscation proceedings under POCA. The court will assess the total financial benefit from the criminal conduct and can make an order to confiscate assets up to that value. This can include money, property, vehicles and other valuable items. POCA proceedings are a complex area of criminal law, and you should consult our team at the earliest opportunity, so we can act fast to protect your wealth.

A conviction also results in a permanent criminal record, which affects future employment opportunities, your ability to travel to certain countries (like the USA) and applications for financial services like mortgages.

Factors that can increase or decrease a sentence

Should guilt be established, the court will identify a starting point and then consider aggravating and mitigating factors to adjust the sentence. This is where a criminal defence solicitor will make sure that all mitigation is properly presented, and challenge any attempt by the prosecution to rely on aggravating factors that are not supported by the evidence.

Aggravating factors include:

• Previous convictions
• Operating in a school or near youth facilities
• Exploiting children or vulnerable persons in the operation, such as in county lines cases
• High purity of the controlled drug
• The conspiracy being committed while on bail for other drug-related offences

Mitigating factors can include:

• Early guilty plea. A plea at the first opportunity can result in a reduction of up to one-third
• No previous convictions or no relevant criminal history
• Genuine remorse
• Coercion, intimidation or exploitation, where it can be shown that a person was pressured or forced to participate. In some cases, it can form the basis of a full legal defence under the Modern Slavery Act
• A lesser role in the conspiracy
• Age and/or lack of maturity
• Serious medical conditions
• A determination to address addiction or other issues

The weight given to these factors can have a direct impact on whether you receive an immediate custodial sentence and, if so, how long that sentence will be. If your position is not properly presented, the court will make its decision based on the prosecution’s case. This is why having expert legal representation is crucial to your future freedom and financial prospects, and we vigorously recommend you get in touch with us as soon as you become aware that an investigation is under way.