Details of the brooch worn by Queen Elizabeth II during a visit to the Energetics Analysis Centre at the Defence Science and Technology Laboratory (DSTL) at Porton Down, Wiltshire, to view a display of weaponry and tactics used in counter intelligence, and meet staff who were involved in the Salisbury Novichok incident. The brooch was a gift from the Duke of Edinburgh in 1966, for her visit to Porton Down.