Preparing for the possibility of a chemical, biological, radiological or nuclear (CBRN) attack on British soil is something that has taken a back seat over the last couple of decades, with the UK's military efforts being largely focused on CBRN concerns in the Arab Gulf and Syria.
But as David Oliver outlined in an article for the Chemical, Biological and Nuclear Warfare magazine CBNW earlier this year, that focus had to be rapidly redirected in March 2018 in response to the Novichok nerve agent attack in Salisbury, Wiltshire.