On April 5, 1968, Alan Pollock diverted his Hawker Hunter toward London and flew under Tower Bridge. Here is the technical account of an act of rebellion that became legendary.
In Summary
On April 5, 1968, Flight Lieutenant Alan Pollock intentionally broke formation from a group of Hawker Hunter FGA.9s returning to RAF West Raynham from Tangmere. At 32 years old, this experienced Royal Air Force officer decided to single-handedly organize the flypast that his superiors had failed to schedule for the RAF’s 50th anniversary. He reached London at ultra-low altitude, followed the Thames, completed three circuits around Westminster, dipped his wings to the RAF Memorial, and then continued east. Tower Bridge appeared before him almost at the last second. Pollock decided on the spot to fly between the bridge’s lower roadway and upper walkways in his Hunter XF442. The maneuver was not part of his initial plan. The passage was over in a matter of seconds. Pollock was arrested upon his return and ultimately left the RAF on medical grounds without facing a court-martial. It was an undeniable aeronautical feat, but also an immense risk, which went on to become one of the most famous episodes in RAF history.
The Tower Bridge Flight Stemmed from a Deep Crisis Within the RAF
Alan Pollock’s flight under Tower Bridge is often summarized as a moment of spectacular madness. The real story is far more compelling.
One must go back to early 1968.
On April 1, the Royal Air Force celebrated the 50th anniversary of its creation. It had been formed on April 1, 1918, through the merger of the Royal Flying Corps and the Royal Naval Air Service.
However, its jubilee occurred during a difficult era.
British defense policy had been evolving since the 1957 Defence White Paper. London was progressively downsizing certain conventional forces, closing bases, and relying more heavily on missiles and nuclear deterrence. On January 16, 1968, new cuts accelerated the British withdrawal east of Suez and the cancellation of the procurement of 50 General Dynamics F-111s.
For a portion of the aviators, these decisions symbolized the decline of British air power.
Pollock shared this frustration.
Yet, it would be incorrect to claim that the government completely ignored the 50th anniversary. An official dinner was held at Lancaster House on April 1, and a Royal Review was scheduled at RAF Abingdon for June 14. Pollock’s grievance was far more specific: no major flypast over London was planned to mark the April 1 anniversary date.
To a fighter pilot, that distinction mattered.
Pollock believed an air force should celebrate its history in the skies.
The Pilot Was Neither a Novice Nor an Improvised Daredevil
Alan Richard Pollock was 32 years old at the time of the event.
He was a senior operational flight commander with No. 1 Fighter Squadron, one of the RAF’s oldest units.
He had entered RAF College Cranwell in 1953 before earning his fighter pilot wings. He flew Hunters in Germany with No. 26 Squadron, served as an instructor, and built up extensive experience in high-speed, low-altitude flying.
He had also participated in the early days of the Yellowjacks, one of the aerobatic display teams that preceded the Red Arrows.
His background is essential to understanding what was to unfold.
Flying a jet aircraft under Tower Bridge is not simply a matter of bravery. It requires absolute mastery over the aircraft’s trajectory, airspeed, and energy, as well as keeping enough margin to abort until the very last second.
Pollock was exceptionally well-versed in tactical low-level flying.
He had also seen operational missions in the Middle East. Notably, in 1967, No. 1 Squadron took part in the operation to set fire to the oil spilled by the grounded supertanker Torrey Canyon off the coast of Cornwall.
Pollock was, therefore, an experienced combat pilot.
This context makes his decision technically understandable, though it does not make it reasonable.
The Hawker Hunter FGA.9 Was Built for High-Speed, Low-Level Flight
The mechanical protagonist of the story was the Hawker Hunter FGA.9 carrying the serial number XF442.
The Hunter was one of the premier post-war British fighter aircraft, entering RAF service in 1954.
The FGA.9 variant was a ground-attack and fighter adaptation of the Hunter F.6. A total of 128 airframes were converted to this standard.
The aircraft featured a reinforced wing structure, a drag chute, and the capability to carry large external fuel tanks.
Its wingspan measured 10.26 meters (33 ft 8 in).
The Hunter F.6 from which it derived utilized a Rolls-Royce Avon turbojet producing approximately 45 kN of thrust. Its maximum speed at sea level reached roughly 1,150 km/h (Mach 0.94).
These performance figures highlight the almost surreal contrast between the Hunter and Tower Bridge.
The bridge is a Victorian structure completed in 1894. Its upper walkways sit approximately 33.5 meters above the roadway and 43.5 meters above the Thames at high tide.
In 1968, Flight International described the gap taken by Pollock as an opening roughly 61 meters wide by 33.5 meters high (200 feet by 110 feet).
The aperture was thus considerably larger than popular depictions often suggest.
The danger primarily came from the speed.
The Initial Plan Did Not Include Tower Bridge
On the day before the flight, April 4, Pollock and four other pilots flew from West Raynham to RAF Tangmere.
Tangmere was hosting its own celebrations at the time, and the evening was lively.
However, Pollock had been sick for several days. He was suffering from a severe cold, taking antihistamines, and getting very little sleep. The reception on April 4 also included champagne. Pneumonia would be diagnosed shortly thereafter.
These factors would prove significant in the proceedings that followed.
Yet, there is no indication that Pollock was unfit to handle his aircraft. According to his own account, both a doctor and a RAF psychiatrist cleared him as mentally lucid on the evening following the flight.
On the morning of April 5, he finalized his plans.
His goal at that stage was simply to conduct an unauthorized flypast over London.
Tower Bridge was not part of the plan.
Pollock calculated a route and several speed regimes. He planned to enter London airspace at low altitude to stay beneath the bulk of commercial air traffic.
Taking off from Tangmere in a five-Hunter formation, he slowed down after takeoff, drifted wide, and simulated radio transmission troubles to detach himself from the group.
He was now on his own.
The Hunter Enters London Following the Thames
Pollock began by making a low-altitude pass over Dunsfold Aerodrome—the airfield associated with Hawker and the birthplace of the Hunter.
He then set course for the London area.
He passed close to the Heathrow approach paths while keeping extremely low. Joining the Thames in the Richmond area, he used the river as his primary navigation axis.
The route looks straightforward on a map; navigating it at several hundred kilometers per hour at tree-top level is anything but.
Bridge after bridge rapidly appeared ahead.
Pollock flew over Wandsworth, Battersea, and Chelsea before approaching Westminster.
He made no attempt to be discrete.
Nearing Parliament, he advanced the throttle of his Rolls-Royce Avon and executed three circuits around the Houses of Parliament.
Big Ben struck noon.
Pollock was determined to make his statement heard.
He took care, however, to stay clear of Buckingham Palace. He also had to navigate around Millbank Tower—a 118-meter skyscraper he had forgotten about after spending years away from central London.
Completing his third circuit, he re-aligned with the Thames.
As he passed the Royal Air Force Memorial on the Victoria Embankment, he banked his Hunter in a formal dip of the wings.
This sequence of the flight was entirely deliberate.
What happened moments later was not.
Tower Bridge Appeared Almost at the Last Second
Pollock continued heading east.
He chose to follow the line of the river rather than climbing north immediately, reasoning that this minimized the risk of encountering incoming commercial traffic bound for Heathrow.
He flew past one central London bridge after another.
He cleared London Bridge.
And then Tower Bridge came into view.
In accounts published years later, Pollock stated that he simply had not anticipated that the bridge would be sitting directly in his flight path.
He could easily have pulled back on the stick and climbed over it.
Instead, another thought struck him.
Fly through it.
Pollock estimated he had about ten seconds to make his decision. A later reconstruction narrowed that window to roughly seven seconds, depending on the precise location where he is presumed to have identified the gap.
At that scale, the exact count matters little.
The decision was made almost instantly.
The Passage Under Tower Bridge at Several Hundred Kilometers per Hour
Estimates of his exact speed vary.
Later accounts suggest roughly 350 to 400 knots (approximately 650 to 740 km/h). British press reports at the time also cited speeds close to 400 mph (around 644 km/h).
No public telemetry exists to state a single precise figure with absolute certainty.
Even at 650 km/h, however, the Hunter was covering roughly 180 meters per second.
The gap between the towers spans about 60 meters.
Thus, the aircraft traversed the critical zone of the bridge in roughly a third of a second.
This is where the true difficulty lay.
Laterally, the Hunter did not fill the opening. Its 10.26-meter wingspan theoretically left several dozen meters of clearance between the wingtips and the towers.
Vertically, there was also sufficient space.
Yet Pollock could not simply fly straight down the middle.
Vehicles were driving across the roadway below. In particular, he spotted a double-decker London bus. Consequently, he chose to keep the Hunter relatively close to the upper structure.
That decision created the single most dangerous moment of the entire flight.
The Pilot Thought for a Second He Had Forgotten His Tail Fin
On immediate approach to Tower Bridge, the steel cross-girders suddenly filled the cockpit windscreen.
It was then that Pollock realized something obvious he had momentarily failed to visualize: extending above and behind his cockpit was a vertical tail fin several meters tall.
For a fraction of a second, he believed the tail was about to strike the upper structure.
There was no time left to make a corrective input.
The Hunter shot through.
The tail fin remained intact.
Moments later, XF442 was continuing its course downriver toward Greenwich.
One should avoid overly romanticizing the moment: an error of just a few meters could have caused a catastrophic disaster in the heart of London. The bridge was open to traffic, with vehicles and pedestrians nearby.
The Metropolitan Police were quick to point this out.
It was a masterclass in piloting; it was also a massive breach of safety regulations.
Both statements are equally true.
The Flight Did Not End at Tower Bridge
Pollock could have returned directly to base.
He chose not to.
He continued eastward before turning north to buzz several other airbases.
He carried out low passes over RAF Wattisham, Lakenheath, and RAF Marham.
Arriving back at West Raynham, he concluded his flight by executing an inverted pass over his home station before coming in to land.
By then, his fuel reserves were critically low. In his account, Pollock noted having less than 400 pounds of fuel remaining—roughly 180 kilograms.
He shut down the engine.
He knew full well what awaited him.
In a telltale sign of his mindset, Pollock later explained that he himself suggested to his superiors that it might be time to place him under arrest.
He was placed under close arrest on April 5.
The RAF Ultimately Chooses Against a Court-Martial
The matter immediately became a severe embarrassment.
The issue was not merely disciplinary.
It was political.
A senior officer had just violated a series of aviation regulations over the capital to protest government defense policy and the RAF’s handling of its own milestone anniversary.
A public court-martial would give Pollock an unprecedented platform.
The groundswell of public support he received further complicated the situation.
Six Members of Parliament tabled a motion in the House of Commons in his favor (though it was ultimately withdrawn as the case was deemed sub judice). Pollock also received numerous letters of support. BOAC, the predecessor of British Airways, reportedly even sent him a keg of beer.
However, public admiration could not erase the legal severity of his actions.
A Summary of Evidence was prepared.
Pollock expected a court-martial.
It would never happen.
Medical Grounds Offer the RAF an Exit from an Impossible Situation
In the weeks following the incident, Pollock’s physical condition deteriorated.
The pneumonia that had been brewing during the flight fully manifested. He spent time in RAF hospitals at Ely and Wroughton.
On May 31, 1968, the Ministry of Defence announced that Air Marshal Sir Thomas Prickett had decided, based on medical advice, not to try Pollock by court-martial.
The official rationale was straightforward: a trial would risk damaging his health, both immediately and in the long term.
Pollock subsequently appeared before a medical board and ultimately left the RAF on medical grounds.
Here, the historical record requires precision.
It is impossible to state as an indisputable fact that his medical discharge was purely a political maneuver.
It was, however, Pollock’s own interpretation.
As early as June 1968, Flight International openly questioned the unusual nature of the decision. The magazine noted that a medical discharge offered the authorities a remarkably convenient way to avoid a public hearing where internal discontent within the RAF would be aired.
The theory is far from recent; it was not invented decades after the fact.
The Legend Obscures Several Frequently Misreported Details
First, Pollock was not the first pilot to fly under Tower Bridge.
He was the first to do so in a jet aircraft.
As early as 1912, Francis McClean had flown through the bridge’s structure in a Short floatplane. Other aviators followed before 1968. Flight International considered Pollock the fifth pilot to fly through Tower Bridge, and the first to make the passage downstream in a jet.
The second myth concerns premeditation.
The flypast over London was planned.
The passage under Tower Bridge, however, appears to have been entirely spontaneous. The absence of pre-positioned photographers and Pollock’s own detailed account support this conclusion.
The third involves the nature of the event itself.
This was not an episode of British naval aviation. Pollock belonged to the Royal Air Force, not the Royal Navy’s Fleet Air Arm.
It is very much a story of British military aviation, but specifically of the RAF.
The Gesture Remains Famous for Combining Skill, Politics, and Transgression
Alan Pollock passed away on July 1, 2025, at the age of 89.
More than half a century after his flight, his passage under Tower Bridge retains a unique resonance.
There are technical feats in aviation that were far more difficult. There are military missions that were infinitely more dangerous. There are also political protests that carried far greater historical consequences.
Yet few events so perfectly align an iconic aircraft, a world-famous landmark, an experienced fighter pilot, and a split-second decision.
At the time, the Hawker Hunter embodied a certain British vision of aerial warfare: fast, elegant, powerful, and directly controlled by the pilot. Pollock was protesting precisely against what he perceived as the gradual erosion of that culture.
His gesture resonated symbolically because it pushed that logic to its absolute extreme.
He wanted to remind the world that the RAF still possessed pilots capable of flying fast and low. He demonstrated it in a way that no one could ignore.
Yet that same flight also illustrated why an air force depends on strict discipline. At over 600 km/h over a capital city, individual initiative can turn into a collective disaster in a matter of seconds.
It is this inherent tension that prevents the events of April 5, 1968, from being reduced to a simple story of a daredevil stunt. Pollock did not merely fly a Hunter under a bridge. He transformed a few minutes of disobedience into a spectacular critique of the RAF, its leadership, and British military policy.
And he did so in the only language he believed impossible to ignore: that of a Rolls-Royce Avon engine roaring at ultra-low altitude over London.
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