Hazardous Cargo
If you transport dangerous goods by air, sea, road, rail or inland waterway, you must pack and transport them according to international regulations.
The UN Model Regulations put the rules on the different transportation methods into a classification system. This system assigns each dangerous substance or article a class that defines the type of danger the substance presents. The packing group (PG) then further classifies the level of danger according to PG I, PG II or PG III.
Together, class and PG dictate how you must package, label and carry dangerous goods, including inner and outer packaging, the suitability of packaging materials, and the marks and label they must bear.
Other regulations define the training and qualifications that dangerous goods drivers and safety advisors must hold, and when you must use one.
The link below gives further information from the GOV.UK web site on the various requirements for moving dangerous goods.