The satellite Prospero was placed into orbit by the Black Arrow R3 launch.
The 14 defunct U.K.-linked spacecraft in LEO include X-3 Prospero, its Waxwing upper stage, X-4 Miranda, UoSAT 3, UoSAT 4, UoSAT 5, UoSAT 12, SNAP-1, UK-DMC, Topsat, UKube-1, TDS-1, UCLSat, and RemoveDebris.
The Prospero satellite was built in Farnborough, United Kingdom and launched from Woomera, South Australia in the 1970s.