Portsmouth area and Wartling radar station, southern England
Incident period: 1 June 1950; examined by the Flying Saucer Working Party in 1950–51
A Meteor pilot reported a bright metallic object above the Portsmouth area. A radar station also recorded an exceptionally fast apparent target. At first, the two accounts seemed to reinforce one another. The surviving British government investigation followed both reports back to their observers—and found a timing difference which changed the case.
A brief sighting over Portsmouth
On 1 June 1950, a Meteor pilot returned to RAF Tangmere and reported an unusual encounter. At about 14:30, he had been flying east at 20,000 feet over the Portsmouth area when he saw a circular, bright metallic object on an approximately opposite course. He placed it higher than his aircraft and off to starboard.
The account preserved by the Flying Saucer Working Party gives estimated separations of 1,000–2,000 feet vertically and about 1,200 yards horizontally. These were the pilot’s impressions during a short encounter. He watched for roughly fifteen seconds and was able to look away to port, then find the object again.
He could not make a firm speed estimate. A figure of around 800 knots appears in the report as his suggestion, rather than a speed independently obtained by tracking the object. That distinction becomes important when the visual account is compared with the very different figures generated from radar.
The response at Wartling
Tangmere contacted the radar station at Wartling. Its duty controller and three operators had noticed an unusual response on the plan-position indicator, the display on which range and direction could be followed. It appeared to show something approaching and then receding at very high speed.
The reported radar speeds were approximately 1,300–1,650 knots. Different operators described different aspects of the display: one stressed a thick response and prolonged afterglow, while another saw a short, weak signal with additional shadow-like indications between positions.
Those descriptions were more informative than the headline speed alone. They concerned the behaviour of an electronic display, not a photograph of an aircraft. The later technical analysis concentrated on how such a response might be generated and whether it had occurred at the same time as the pilot’s observation.
The apparent connection
Initially, the direction of the receding radar response seemed capable of matching the course described by the Meteor pilot. That made the incident attractive as a possible radar-and-visual case: a pilot’s sighting accompanied by instrumental evidence from the ground.
A member of Fighter Command’s Research Branch interviewed the people involved. According to the Working Party report, that enquiry established a difference of ten minutes between the two events. Each time was considered accurate to about a minute. The report consequently treated the radar response and visual observation as unconnected.
This is not a case in which a vague difference of a few seconds was used to dismiss an otherwise continuous track. The recorded gap was substantially larger than the stated timing uncertainty. Any later account presenting the radar as a simultaneous confirmation of the pilot’s object needs to address that finding.
Graham’s technical explanation
The Working Party included an appendix by G. E. G. Graham of scientific intelligence. He proposed interference from another radar transmitter, possibly shipborne in the Portsmouth–Isle of Wight area. His explanation concerned the timing of pulses received directly from another transmitter.
If the pulse repetition rates of two sets were briefly close, the second transmitter’s signal could appear on the Wartling display. A small drift between the rates could then make the apparent position move rapidly along the scan. To an operator interpreting it as an ordinary reflected target, that movement could look like exceptional speed.
Graham also explained why the signal might appear strong and why secondary reflections could resemble the reported shadows. The appendix therefore offered a mechanism tailored to the display’s peculiarities. It did not identify a particular ship and reproduce its operating log, so the distinction between an explanatory model and a traced transmitter remains part of the record.
What the investigators said about the pilot
The visual report was assessed separately. The Working Party favoured a meteorological balloon or an optical misinterpretation, suggesting that the object’s speed had been overestimated. It did not document a specific balloon launch which could be matched to the Meteor’s position.
The report’s treatment of the pilot should be read in its own terms. A trained observer had reported something he found unfamiliar; the committee proposed a conventional explanation on the available description. Neither a measured extraordinary speed nor a positively identified balloon emerges from the surviving summary.
That leaves a more precise historical conclusion than either of the usual extremes. The two reports were genuinely investigated, but the committee did not regard them as one corroborated event. Its technical radar explanation and its visual identification were also supported in different ways.
Britain’s first official UFO study
The incident was one of three British service reports examined in detail by the Flying Saucer Working Party, established in 1950. Two further observations came from Farnborough and are covered in their own UKPX case file. They concern different witnesses and dates, although they were considered by the same committee.
The Working Party’s June 1951 report reviewed American investigations, British reports and possible sources of error. It recommended against further investigation of isolated reports unless material evidence became available. The Portsmouth episode helped shape that assessment because it appeared initially to combine experienced aircrew and radar operators.
The surviving copy linked below appears within a later Ministry of Defence file. It is the reproduced 1951 report, not a new investigation conducted at the date of that later file’s release. Keeping document date and release date separate is essential to following the case’s history.
Following the two locations
The visual sighting occurred over the Portsmouth area; the radar operators were at Wartling, far to the east. Tangmere was the station to which the pilot returned. These three names refer to different roles in the account, rather than competing descriptions of one ground location.
The UKPX pin marks Portsmouth broadly. It is not the pilot’s exact airborne position and does not imply that Wartling radar stood in Portsmouth. The original document provides the observation geometry and the technical appendix; a single pin cannot represent the whole chain of enquiry.
What makes the case worth preserving is the work between the first report and the final assessment: checking the timing, interviewing the observers and examining how the radar display behaved. The ten-minute discrepancy is one of its most consequential findings, while the identity of the pilot’s bright object was never established through a recovered specimen or a traced flight.
Timeline
1 June 1950, around 14:30: the Meteor pilot reports a metallic-looking object over Portsmouth.
The same date: Wartling operators record an unusual high-speed apparent radar response.
Subsequent interviews establish a ten-minute difference between the two observations.
June 1951: the Flying Saucer Working Party reports its findings and technical explanation.
Sources & further reading
Flying Saucer Working Party report, reproduced in DEFE 24/2062, PDF pages 75–78 — Original government assessment of the visual report, timing interviews and Graham’s radar-interference appendix.
Related case files
Farnborough, 1950: Stan Hubbard’s disc sightings and the first British UFO inquiry
RAF Topcliffe, 1952: the aircrew, the falling-leaf object and the surviving report
Location note: Broad Portsmouth reference for the airborne visual report; Wartling was a separate radar station and the exact aircraft position is not mapped.
UKPX historical case file. Researched and checked 4 November 2026. Explore the UK case map · Links & Sources.