Health and Safety legislation requires you to ensure, so far as is reasonably practicable, the health and safety of all employees while at work. You also have a responsibility to ensure that others are not put at risk by your work-related driving activities.
The Highway Code is one of the most widely recognised books in the country. It lists everything that we must and must not do when driving a car. It also lists best practice in driving behaviour in areas where the government has decided not to legislate.
If your vehicles carry dangerous items you need to register with the Environment Agency. For this purpose, dangerous items include: toxic gases; butane gas; propane gas; explosives; fireworks; other flammable items; strong acids; and radioactive materials.