The HSE completed a Crown Censure with the Defence Science and Technology Laboratory (Dstl) following a joint Police and HSE investigation into an incident on 14 August 2002. Dstl employees, including Terry Jupp, were carrying out classified tests on explosive compounds when a mixture ignited. Mr Jupp suffered 85% burns and died from his injuries one week later. An investigation established that the employees were not protected by a screen or PPE, and by accepting the Censure, Dstl acknowledged safety failings, including inadequate or poorly followed risk assessments in situations where explosions were clearly foreseeable.

Dstl, an agency for the MoD, cannot be the subject of a prosecution by the HSE as it is a Government body. However, Crown Censure is a process which is applicable to Crown employers and is in lieu of criminal proceedings.