[en] The purpose of this paper is to highlight the decommissioning costs of British nuclear installations. For all nuclear reactors, the process is normally carried out in three stages. Although the first stage of the decommissioning programme takes about four to five years, the final stage will be delayed for about 100 years after the end of the reactor's operating life. The Government's policy is that it is the responsibility of the nuclear licensees to decommission their own plants which includes managing and disposing of the resulting radioactive wastes. As part owner of certain nuclear industry companies the Government must accept some liability. The National Audit Office aimed to determine the extent of the Government's potential liabilities for such decommissioning, and how it should be financed with the possible implications to the British taxpayer. (author)