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The Gloster Meteor U Mk.21 was an unmanned drone, similar to the U Mk.16 and like that aircraft based on the F Mk.8 fighter. The only significant difference between the U.21 and U.16 was the electronic telemetry equipment, with specific equipment installed in the U.21 for use at the Weapon’s Research Establishment at Woomera.
Flight Refuelling Limited converted one F.8 and seven U.16s to the U.21 standard, with work beginning in 1962. Fairey Aviation in Australia converted fifteen ex-RAAF F Mk.8s to the U.21 standard, using kit parts provided by Flight Refuelling Limited. One of these aircraft was later shipped back to the United Kingdom (July 1971), and converted back to the U.16 standard, only retiring on 11 October 2004, in the same month as the closure of RAF Llanbedr.