Gloster had built Britain’s first jet, the Meteor, and it staked its future on the Javelin. The delta wing was chosen for a practical reason: it gave enormous internal volume for fuel, radar and cannon while keeping a low wing loading for high-altitude flight. But the tail was the gamble. Placing the tailplane high on the fin — the “T” layout — kept it clear of the wing at low speed on paper, yet in a steep, slow climb the wing’s wake could blanket it entirely, robbing the pilot of pitch control in a deep stall. That flaw would cost lives in testing.

The Javelin was also the end of the line. By the time the definitive FAW.9 was in service, the supersonic English Electric Lightning was already coming, and the 1957 Defence White Paper was busy cancelling manned fighters altogether. Gloster — a name that reached back to 1917 — built no aircraft after the Javelin. When the last squadron stood down in 1968, a 51-year story ended with it.

The high T-tail was the Javelin’s Achilles heel. In a slow, nose-high attitude the delta wing could shroud the tailplane in its own turbulent wake, leaving the elevators biting on dead air — a deep stall from which recovery was almost impossible. On 11 June 1953 the second prototype, WD808, entered exactly this condition; test pilot Peter Lawrence rode it down trying to recover and ejected too late, and was killed. The accident, and later flat-spin losses, drove the fitting of stall-warning devices and shaped how crews were taught to handle the aircraft near its limits.

Even the first prototype nearly ended in disaster. During early testing the elevators tore away from aerodynamic flutter, leaving chief test pilot Bill Waterton with an aircraft he could barely control in pitch. Using engine thrust and the tailplane trim, he nursed the crippled Javelin back and put it down — then stayed aboard the burning wreck to save the flight-test recorder. He was awarded the George Medal. Waterton had earlier called the machine “as easy to fly as an Anson,” but warned from the start that its power controls were not up to the job.

The Javelin was a British state procurement of the early 1950s, ordered in batches for the RAF and never sold on an open market, so a tidy modern-style flyaway unit price simply is not part of the public record. Production was split between Gloster and Armstrong-Whitworth, both inside the Hawker Siddeley group, and part of the programme was underwritten by a large U.S. order under the Mutual Defense Aid Program. Any single dollar or pound figure you see attached to one Javelin should be treated as an estimate, not a sourced fact — and no credible public cost-per-flight-hour number exists for the type.