The British Newspaper Archives has several reports from different newspapers showing.
I do not know how complete a report you are after, as each will depend on what the newspaper chooses to write.
Flying Saucer joins N.A.T.O.'s big exercise
"FLYING SAUCER" entered Exercise "Mainbrace" to-day following a report from the R.A.F. station at Topeliffe (Yorks) of a white object having been seen which accelerated at a speed in excess of a shooting star. R A F officers at the Mainbrace headquarters in Fifeshire would not state what view was being taken of the report. An R.A.F. spokesman refused to commit himself whether the report was regarded as a serious one. He added: "It is being investigated." The report led to a N.A AF I saucer being placed on the plot of the exercise. The saucer, fastened with ribbons. was placed on the plot alongside the name Topcliffe. and the R.A.F. duty controller opened up a new signal file headed "saucer sightings and movements" where he could file further signals on the object. The object was seen by about ten R.A.F. officers and men. the crews of Shackleton aircraft operating from Topcliffe. The signal reporting what they had seen was passed by the intelligence officer at Topclife to the maritime headquarters at Pitreavie (Fife) and to Coastal Command headquarters at Northwood (Middlesex). The signal said that the object was seen at 10-53 am. yesterday when a Metoer aircraft was at 5.000 feet and was A white object was seen five miles astern of the aircraft at approximately 15.000 feet.
SILVER IN COLOUR It was moving at a comparatively slow speed on a course similar to that of the aircraft The object was silver in colour and circular. It maintained a slow forward speed before beginning to descend. swinging like a pendulum. It was thought by those who saw it to be a parachute or cowling from the Meteor. but an RAF spokesman said to-day that no Parachute or cowling had fallen in the vicinity of the station. The signal reported that the aircraft turned towards Dishforth and the object. while still descending. appeared to follow. It then began a rotary motion about Its own axis. but it suddenly accelerated at Incredible speed in a westerly direction. then turned to a south-easterly course.
NOT SHOOTING STAR Those who saw it stated that its movements were not identifiable with anything they had seen in the air, and that the acceleration was in excess of that of a shooting star. The duration of the incident was between 15 and 20 seconds. The object was seen by Flight Lieut. Kilburn and Flight Lieut. Cybulski. both captains of aircraft, by Filing Officer Paris. Master Signaller Thompson. and by about six other aircrew members. An Air Ministry Meteorological Office spokesman said: "The object could have been a Met. balloon. They are released daily." Such balloons are sent up from Liverpool. Leuchars. Stornoway and Aldergrove. They are about six feet in height and are white. An Air Ministry spokesman said this afternoon: "We have no comment to make on the report of the sighting of a flying saucer."