Propellants, Explosives and Rocket Motor Establishment explained

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.