The new rocket engine test facility at Westcott, Buckinghamshire, UK, designed for the first ground demonstration of the SABRE airbreathing rocket engine, designed by Reaction Engines Ltd with ESA support. It will consist of a multipurpose propulsion test stand designed to accommodate various test engine configurations, an assembly building, workshops, offices and control room. The location of workshops and other support facilities alongside the test stand will enable configuration changes to the engine to take place at the site, reducing the down time between testing phases and accelerating the engine’s development.