Following the split of DERA in 2001 into QinetiQ and Dstl , the Fort Halstead site was retained by QinetiQ who leased part of the site back to Dstl . Its most recent principal functions have been research , test , evaluation and forensic analysis into explosives , and the site 's explosives laboratory was again used in the investigation following the attempted 21 July 2005 London bombings . The facility has been the largest employer in the Sevenoaks district , with 1,300 personnel working on the site in 2000
21 July 2005 London bombings
21 July 2005 London bombings
Fort Halstead