Regulations governing the transport of radioactive material are based on standards developed by the International Atomic Energy Agency (IAEA) and regulated in Great Britain by the Office for Nuclear Regulation (ONR).
ONR (and previously the Department for Transport) commissions the Centre for Radiation, Chemical and Environmental Hazards Division of the Health Protection Agency (formally the National Radiological Protection Board) to carry out surveys into the radiological impact of the transport of radioactive material in the UK. Surveys on transport under normal conditions are carried out on a modal basis (road/rail, sea and air) approximately every ten years. Reports looking at abnormal events have been published every year since 1989 and made available online since 2001.
Advice on the requirements for transporting radioactive material is available from ONR’s Radioactive Materials Transport programme.
You can contact them at: mailto: firstname.lastname@example.org
You can find the guidance here.