Cannabis is listed as a Class B drug under the Misuse of Drugs Act, but CBD is not listed as a controlled substance under this act. CBD oil is legal in the UK if it has a THC content of below 0.02% with THC being a controlled substance under the Misuse of Drugs Act 1971.
Firstly, the CBD must be extracted from an industrial-grade hemp strain that’s been approved by the EU. Hemp differs from marijuana as it is naturally high in CBD and low in THC, and therefore your CBD should be derived from Hemp.
This means that with more producers of hemp-derived CBD, it's necessary that we have better means to differentiate between the quality growers and processors so that we can easily understand companies who are labouring to make quality products and companies who might just be in it for a quick buck.
Which is why the Cannabis Trade Association was formed, to provide high standards and "giving confidence to consumers and law enforcement that hemp products are safe, and legal." To make shopping for hemp products easier, there's now a seal of membership for companies and their products that meet the stringent standards of the CTA, FSA and MHRA and pass a third-party audit.