Propellants, Explosives and Rocket Motor Establishment

Propellants, Explosives and Rocket Motor Establishment, usually known for brevity as PERME, operated at two sites:
 * Waltham Abbey Royal Gunpowder Mills, known from 1977 as PERME Waltham Abbey
 * Rocket Propulsion Establishment established at RAF Westcott in 1946, also known as PERME Westcott
 * RAF Spadeadam, also known as the Rocket Establishment was not officially part of PERME but was often confused with it.